400 MPH Bowling Ball to the Dome with  

Now imagine being on a battlefield during the Napoleonic wars and having whole batteries of cannons firing high speed iron balls at you as you walk forward. This was a very good demonstration of why cannons make a mess of infantry formations.

Great to hang with you lads, so much fun. Let’s go again in 2024!

I am just really happy that the slo mo guys are still pulling big numbers!

At <a href="#" class="seekto" data-time="245">4:05</a> you've got the best representation of what an "investigative journalism" award looks like

There's Brett's knowledge of the human body, Gavs tech precision and Dan's explosive expertise. And Scott.

“Okay so hear me out, two Aussies and two Brits walk into a massive open field with a bowling ball canon” 😂

The banter between the boys has been great every video with you all colabing. Love these cross over vids. Hope for many more.

It really puts into perspective of what canons through history did to people. It’s awesome and terrifying all at once.

Slow mo guys and their bantering are like wine. They get better and better with time. I see the time approaching where no actual slowmo content is needed anymore and I'm satisfied with seeing them joking around in front of the camera.

The four of you should do ALL of your videos together. Brilliant and hillarity all around.

One of the greatest and most wanted collabs I'd say. So happy to see intense slow motion with the ridiculous nature of breaking things, match made in heaven. What I was not expecting was the absolute brutality of seeing a bowling ball smash a skull into shards, I'm getting a headache just watching it smash them.

Don't you just hate it when your having a drink with your friends and someone just throws a 20pound bowling bowl at 400mph at your head

It’s Brett and Scott’s reaction to Dan’s bigs words for me 🤣 Classic How Ridiculous 😂

Been waiting for this collab for many, many years. It did not disappoint. I always thought the Slow Mo guys and How Ridiculous would get on splendidly. Best friends forever!!!!

Frame by frame at <a href="#" class="seekto" data-time="263">4:23</a> you can see a flash when the bowling ball impacts the head!! I love that phenomenon

Pure Napoleonic realism level here!! Those battles were gruesome and yet so legendary! Now I have a better understanding of the ordeal Marshall Lannes had to face when he saw a good friend of his being literally decapitated by a cannonball, only to follow a similar fate when another cannonball ricocheted and destroyed his leg, eventually killing him after a sad, agonizing death...What a man!! No wonder why the Emperor himself cried profusely the death of one his best friends/ Marshalls, but also one of the best military geniuses of all time!! RIP, brave Marshall Lannes!!

That moment Dan is perplexed by what he got in his hands is priceless ahahahahah

Seeing the flash of fire as the ball hit the first head in the line was mindblowing. We need more collabs between these two channels

Always great fun to see dem boyz of How Ridiculous!

You obliterated like 15k worth of ballistic dummies and are worried about the table 😂 love you guys

IN THA FACE!!!

So for those wondering: 400 mph is ~180 m/s. That's roughly how quickly a cannonball would be traveling mid-flight in the 18th and 19th centuries. The destruction is a good match for some period accounts too: There's a story of two French captains who hated each other. At the battle of Vellinghausen, a cannonball decapitated one man, and a piece of the skull put out the other captain's eye. So seeing all those pieces scattered so far, just gives a sense of the destruction a cannonball can do.

I was amazed with how perfectly you got that straight. At the same time, That was truly terrifying!

So happy this collab came to be! Love watching both of your channels!

Gav: "Is everyone ready for what is potentially the most questionable thing we've filmed?" Dan's exposed junk in that balloon video: "Am I a joke to you?"

Happy too see Dan sitting this one out as a test dummy😂

Love Gav and Dan - been a fan and watching for years! Brett and Scott, have watched them for years now also. Slo Mo Guys and How Ridiculous are "must-watch" every time a video drops. Great to see you all Legends together (we're missing one - where's the Legend, Derek?) Great video, and a great crew and group as always.

LETS GOOOOO!! I’ve been wanting them to collab for so SO LONNGGGG

The double upload from both channels just shows how committed they are to this video that we’ve been waiting years for!

It’s so wild how different the energy is here between how HR acts on their channel and this one, it’s like night and day but so good to see. Great chemistry too. Hope you guys can do more together

Slo-mo guys have such good senses of humor. 10/10 wit.

This was an amazing collaboration! Love both of your channels!

So good to see such a bunch of wholesome, fun-loving characters together... making heads explode.

Gav, that editing for the repeat impacts w/ the speed dropping rapidly at <a href="#" class="seekto" data-time="550">9:10</a> was SO GOOD.

A chilling idea of the old wars of the past ,using cannonballs over history😢. The carnage!

2 of my favorite you tubers together...this is awsome

That was somehow considerably more brutal than I thought it would be

Strange to see Brett and Scott so chill, without their own brand of energy and made up Aussie-slang etc that they act up on their own channel

I just want to say, I'm french and I used you guys' videos to learn english a while back. So thank you all

I love their love for unique words, I think it's something more people should appreciate

The bowling ball polish was on point tbh, well done dan!

So happy with the wealth of content we're getting from Slow Mo Guys these times, after the awful COVID period

FINALLY!!! 😃😃 The two channels I’ve been wanting to collab for years!!!!

Incredible! Also humbling!

I can't believe it didn't happen sooner, this colab was inevitable

What i liked about this was how real the reactions seemed. Howridiculous is usually very over selling the reactions. Seeing them in a more natual environment was nice. You watch their video they did, and they are much louder on their channel.

Randomly remembered this channel, love you guys

This is easy the coolest slow mo video i ever seen. Truly amazing!

The Aussie and Brittish Humour is simply Unmatched!!! What a great video lads 🇦🇺🇬🇧🇦🇺🇬🇧

That was pretty horrifying...and educational. Makes you think really hard about the life of the old wooden ship sailors and the naval battles, and what the effects were of those broadsides.

Lets just appreciate how over the years, Dan has gotten in better shape. Seriously good job

Great shot from the side of the 5 heads when you showed us the speed of the bowling ball dropping per hit, clever and it’s like info I didn’t know I wanted

I have always though for years that this would be a great collaboration. So glad it finally happened.

Not knowing these people... Running into some Aussies and Brits in the middle of nowhere in Montana would be the wildest experience

I am reminded of the opening scenes of Gettysburg movie. This was another great collaboration!!!

It's nice seeing you guys having fun and making millions. Very entertaining. Talk about rolling heads.

We have waited so long for this collab. Haven't watched How Ridiculous since they stopped doing the tower stuff as much, but this was awesome. We even got some "Science With Gaunson"! "That's right...we do have bones" 😂🤣

<a href="#" class="seekto" data-time="504">8:24</a> there's something deeply satisfying knowing that each of those skulls are unique.

We waited so long for this collab I even forgot we wanted it so badly 🌚

Damn, that was freakin awesome!! Well played boys

This is an an entertaining but also interesting look into canon physics. Makes you really appreciate soldiers that actually went up against canons, considering it could shred half a dozen men in formation instantly.

<a href="#" class="seekto" data-time="494">8:14</a> Remember kids, that for a few hundred years battlefields regularly saw solid shot cannons firing into line formations of riflemen.

Dan, our SlowMo Rexy! My wife and I have been saying for years we'd love to see a Ridiculous Slow Mo collab.... we are SO happy 😊

I've been waiting for this collab for ages

It's just ridiculous, how different Stanford and Gaunson are in a video, like this... In their videos, they are jumping all over the place, laughing, screaming, but now, they are just standing there and walking around, saying stuff... Priceless! 😅

I always worry about chemistry when it comes to collabs but the banter was thoroughly top notch all round 👌

absolutely mind-blowing stuff

Fascinatingly gross! As an avid reader of Alexander Kent's nautical history novels, this brings home the gruesome reality of the damage that canon-fire does. Men were killed or injured by flying bones from other victims! Great video and excellent to see these two dynamic duos together 👍😄

Positively mind-blowing in the most literal sense.

Loved every minute that. What was interesting on the second test, the green blood splattered up, while the rest splattered downwards.

The Windows sounds were brilliant. <a href="#" class="seekto" data-time="468">7:48</a> This part had me all LOL!

Been waiting for this collab for years and it was so much better than my expectations!!! I would love a revisit.

These have been the best colabs!

oh EXCELLENT, a collaboration between my favorite lads.

Always cool to watch these Slo Mo episodes. How about two bowling balls colliding with each other??

Forget who has the most followers, collab with ballistic high speed!

It's funny watching how different countries express humor. You guys are all funny, but in your own unique ways.

Imagine how many more troops an iron canonball might travel through before stopping. Imagine the terrain surrounding the cannons has been groomed to exactly match the ballistic path of the cannon balls. Balls deep.

I must say, the music that starts with the slow Mo video is the best part. Seriously, the music adds something I can't explain but I absolutely love it.

Slo Mo Guys and How Ridiculous -- an excellent collaboration. Thanks very much. We now want MORE.

YOU DONT KNOW HOW LONG IVE BEEN WAITING FOR THIS DREAM COLLAB BRO!!!!!

The Slow Mo Guys, This is so fun! I'm happy I found your channel!

Just... Wow! That escalated quickly. That was fascinating and deeply disturbing at the same time. And, I'm almost as impressed with that column of fire coming out of the end of that cannon as I am by the level of precision and carnage on display. Great video, as usual, fellas. Really well done. Firggin' hilarious, too. This one went right up to 11! All the stars!💥💫👍

Love it when two of my favorite teams get together. Fun to see some of Rexy's crew in a different environment - hope you guys get to do more of this kinda stuff!

You say grim, I say grimtastic! That was insane. Dream channel team up! Well done all.

This team up made me extremely happy!

So much more enjoyable to see Brett and Scott react naturally in this video! Great collab

That was beautiful and horrifying in equal measure. Great job by both teams 🤣

Finish 'em! FLAWLESS VICTORY!

Thank you for making my dreams a reality.

I have been waiting for this collaboration forever!!!!! Thank you for satisfying that itch!!!!!

I LOVE when you show the speed as the collision happens and it slows down, always such a cool detail

This is the best thing I have ever seen.

I love the addition of the deceleration of the bowling ball through the five dummies👍👍

How good! This is how it's done. Twice the video. Twice the entertainment! THANK YOU! 👊👍

Seeing the bones of one skull destroy the next even before the bowling ball arrived was fascinating and very humbling.

love wathing my 2 favorite youtubers together, caught me by surprise when i seen the other 2 there i was like yey!

this collab made my day

To see the gel look so viscous when its usually so tough, jesus the force behind that ball

Years of waiting for this collab and I guess you could call it a smashing success.