I personally kind of like the Powerpuff Girls and Samurai Jack theory, although I imagine Professor Utonium being a descendant of Jack's after he finally got "back to the past," or maybe a reincarnation, rather than them literally being the same people.
There's a theory that Ash's real father is a Lucario and in the Pokemon universe humans and Pokemon when they mate together they have a 50/50 chance of either producing a human or a Pokemon but have Trace abilities of both that's why ash is able to talk to Pokemon and explains his unbelievable strength there was a Pokemon series a long time ago where ash caught a fire pig Pokemon where in the Pokedex it says it is very heavy and in the ending scene of an episode he was raising that Pokemon up in happiness because it evolved
I'd argue that there are a couple of exceptions, but yeah the overwhelming majority of dream/coma theories are absolute garbage. Side note, a few shows have actually done episodes that address this concept, usually mocking the idea. The primary examples that come to mind for me are Buffy The Vampire Slayer's "Normal Again," and Community's "Curriculum Unavailable" episodes.
I wanna add to the Powerpuff theory. What if the girl’s mother is Ms. Bellom? She must’ve divorced from Utonium, and she is now the caretaker of their grandpa. That’s why the major gets depressed when Ms. Bellom leaves, she is his Caretaker, and without her, the major is confused and the dementia kicks in. That might also explain why we never see Bellom’s face, a metaphor about how the girl’s don’t really know her.
20:19 do you think Chris ever found out that King Ramses was based off of an actual Egyptian Pharaoh in real life? his name was King Ramses II and looked almost identical to the one in the show
That scooby doo one had another theory that everything takes place in shaggys head after smoking to much pot and apparently his friends also made up by him or something
It is a pretty cool song. I had it in my head for a while, and I'm happy that you brought it back up. :) He's probably gonna have it stuck in his head too. :D