MOST BRUTAL UFC KNOCKOUTS! 

So happy for Harry, renowned MMA expert, to be the one watching this

Nothing beats a UFC reaction with Harry and Ethan also in the vid!

Nothing is better than watching sidemen reacting to ufc 😂

5:41 that kick was sick!

Harry’s quiet “he’s all stiff as well” at 4:36 is actually kinda wholesome. He’s concerned.

Can't Get Enough Of These Reacts 😂Keep Them Up

Jiri’s knockout over Reyes was so so brutal

I love Ethan tryna explain what’s happening when he is the biggest casual of all time.

we need more sports/combat sports reacts from the sidemen. this was a crazy video

I don't think they realized how badly that Tony ferguson ko broke our hearts 💔

2:47 Don't know why but the way Harry in particular described the fighter being a "Russian Asian" made me laugh out loud

That caught kick/kick to the face ko is my favourite I've ever seen. Just so satisfying to watch

By far the best duo. Harry and Ethan are the goats when it comes to reacting to ufc

more UFC and sports reactions lads, another banger

8:16 now that's how you sell a stone cold stunner

Sidemen are GOATs they never fail to do a good video. and with the UFC connoisseur (harry) makes it even better 😂 *edit ethan and harry ufc reactions are too teir

love these ufc reaction videos

Yayyyy I just binged all their UFC/Boxing/Fighting reactions and now there’s a new one!

Harry and a ufc vid is always gold

Love this trio

Any trio in the sidemen Sidemen fans: They are an underrated trio

Need an updated one

Ngannou throwing an uppercut into overeem and taking him out is still crazy

Love the ufc reactions 👌

7:45 damn Dana White was right about Mazzagatti. Dude really did look like he was doing his grocery list in his head on this one 😂😅

Love this as a UFC/Sidemen fan🤝

Been waiting for a UFC reacts

I love when they react to fighting clips

We need more of these

Loving these contents lads

Another banger from the sidemen

> UFC Knockouts > ONE Championship

That Dan Henderson knockout on Michael Bisping just gives me pain, poor Mikey 😬😢

Boxing knockouts are more brutal, because the ref stops all action and you have a chance to get back up and go again and again and again. Whereas UFC you get knocked out, you’re done.

Been waiting for this one ngl

The intros get more and more enthusiastic 😂 you can tell this wasn’t the first one of the day

5:36 Best one

Need to see more Cage Warriors knockouts next time 😉

I watch sidemen reacts everyday while I eat my lunch. It’s become a part of my daily routine at this point. 😂

Great video but its missing so many classic UFC knockouts!

Awesome job sideman

Nothing better then watching sidemen watch the same video as before

The empathy from Harry!!🥰 “Ref!!”

its great to see w2s the MMA genius reacting to these videos.

UFC is not a sport. MMA is the sport, UFC is a league. Saying you fight UFC is like saying you play premier league instead of saying you play football

2:56 dude looked like mix of Jake Paul and Connor McGregor

I've been waiting for this video for 2 years

You guys need to do more of this you have no idea how entertaining it is seeing Harry in his zone 🤣🤣🤣 y’all need to actually get him into a gym and boxing.. he might not really know how to fight but he’s Defiently got the brain for it you can tell, he understands it. And when a guy understands the sport but hasn’t competed it’s a seriously good trait. And he’s a hard worker. Sky is really the limit once he learns how to box..

I've watched that Chandler K.O so many times, it never gets old

we need more of harry and behz ufc reactions

Masvidal flying knee to Askren is probably the most shocking.

Should watch old ufc knockouts

My favourite type of sidemen reacts vid😁🥳🔥

Vik always bringing sports back to some nerdy comparison 😂 😂

Harry went straight for the kanockouts

Yesss, sidemen & mma

vik has video game references for everything bro😂

Sideman are absolute casuals of the sport

JJ playing kids game out there

harry seem pissed lol

do more ufc!!

Y'all need to watch a Mark Hunt walk off compilation

3:45 it's called MMA Vik UFC is the name of the organisation 😭

Conor sleeping aldo in not even 15 seconds gotta be one of my fav sports memories of all time

Need more ufc vids!!

Good to see the mma expert doing some vids about his area of expertise

The tony one on the thumbnail is a violation.

Harry that joke is still on flight man😂😂

0:20 why do I see and here to 2 ducks squeaking 😂

UFC 286 JUST HAPPENED THIS PERFECT

I would've loved to have seen them react to a Uriah Hall knockout, if I remember correctly his kicks are BRUTAL.

I think I should be sent a T-shirt for watching this at 4am when I should be sleeping 😌

U should do some Muay Thai knockouts they are nuts

5:44 even Vickstar knew that was cold

6:35 I swear Ethan’s said this exact line in another video

Love the little shoutout to my home town from Harry 😂

The purple in viks set up is cold

We need a pure mark hunt compilation

Mark Hunt straight up beast 🔥

They need to react to UFC Slap Fighting

Seeing Harry makes my day my guy is super funny and cute ❤️😂

Mark holding it down for the polys

Mma for me is the best Sport in the word, never miss a ufc event

Next time harry and Ethan are reacting they need to do a best ufc press conference moments

The Iconic duo plus the Ultimate side kick who steals the show

6:24 I swear I've heard Ethan say this exact same thing in the last ufc reacts video

ufc knockouts scares me bro its so brutal

Harry mentioning Wigan, what a great day

Mark hunt is the GOAT of walk off KOs

I’m surprised that Leon edwards ko to usman wasn’t on here. One of the most devastating yet clean KOs ever

Anytime I see Rhonda get slept it makes my day 10 times better

7:57 a young Joe Rogan

Best MMA slams next

Most brutal mma knockouts

Vik at 9:00 Nice joke lol

I was literally thinking they should do this video yesterday so they read my mind!!!

Lads react to Mauy Thai fights they are brutal. Especially Rodtang fights they are on another level.

None of that are as brutal as the Stephen Tries roasts on the last video

Not having Ngannou vs Overeem in here is criminal.

1:50 Johnny sinns fr