Anyways, from my friends and online, there are some conspiracy theories..
Namely Ed, Edd, an Eddy, Spongebob, Aladdin, Pokemon, and Rugrats.... And, MY LITTLE PONY!

Ed, Edd, and Eddy

The daysack they live on is purgatory, many of the characters are children who died of different ages,
for example Ralph is someone who lived in the great depression, and is trying to keep their family wealthy.

Spongebob

In the first episode, Mr. Krabs said he opened the Krusty Krab due to depression from the war. In the episode 'Bubble Bowl' they go into a football game with people,
and Mr Krabs says that he is going to be sick. War against humans and animals?

Aladdin

The genie was stuck in the lamp for ten-thousand years, yet when Aladdin is turning into a prince, he remarks "That is so 3rd century...". How would he know what that century dresses like?
He must of been there, so Agrabah is a post-apocalypse town.

Pokemon
In the first episode, Ash falls off a waterfall, and ends up in a coma.

Rugrats

The main character is supposedly Tommy, when it is really Angelica. She imaged all of them up, because they are really dead. However, Phil and Lil, there really was a baby, and it is still alive.
However, she didn't know the gender, so she made two.

And the killer...... My Little Pony.

Pinkie Pie is in a mental hospital. She is a real person, who lives in a world of ponies, because she is crazy. All the different ponies represent her different personalities, that
explains how there are bad forces at work. The fact that good is usually dominant symbolizes the fact she is recovering.

..............I think people are putting to much thought into this......

The MLP world is a dream being dreamt by a depressed horse in the real world. In Grease (A movie) the two main characters drowned at the beach in the beginning and had to go through High School purgatory before ascending to "heaven", hence the flying car. The jetsons live in the clouds because the world below has been ravaged by nuclear warfare. Legend of Zelda, Infinity Blade, and the Flintstones also take place in a post-apocalyptic world. The spongebob characters are mutated marine animals from the Bikini Atoll testing. In that episode when Spongebob goes to Rock Bottom, the nuclear fallout sank to the bottom of the trench and severely mutated the marine animals there. Shit, so many nukes in movies/games/cartoons.

I thought Ed, Edd n Eddy was explained? Remember the episode where at the end they are old men reminiscing about their childhood?
As for the rest, I'm not sure. It's likely that most of the unexplained 'mysteries' are unexplained simply because cartoons are just nonsense. Ash is probably still ten because the character works best as a ten year-old.

That one guy wrote:..............I think people are putting to much thought into this......

yeah probably.

Jellyog wrote: The show is based on a young girl, Pinkamena Diane Pie (known as the main character Pinkie Pie). Pinkamena killed her family and friends becuause her dolls told her too, she was sent to a mental institution. Pinkamena imagined the pony land, if you have watched the show you will notice Pinkie Pie is always in charge but all of the other ponies help her. Each pony is different, and they each depict a different mental disorder that Pinkamena had.

Yeah, that is not the original source, but whatever. I didn't know about the dolls, but I knew how each pony depicts a mental disorder.

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Awesomeguy147 wrote: In portal 2 there is also the hinting that GLaDOS was actually Chell's mother.

Actually, a conspiracy is something hinted, but not confirmed. GLaDOS being Chell's mother was true. The game reveals that GLaDOS was once a human, a woman, and had connections to Cave Johnson.
Now for some backstory. Doug Rattman has Schizophrenia, and was treated for it. He was a scientist there when GLaDOS was booted. Now for the main story; After making potatos for 'BRING YOUR DAUGHTER TO WORK DAY', Chell made the biggest potato ever. She also says 'Mr. Johnson', because she doesn't know Cave is her dad, he doesn't want to stop giving any dedication to Aperture. So, Chell and all the other children are there during GLaDOS' awakening. However, they were OUTSIDE the room, and GLaDOS only captured them for 'testing'. She picked those with low dedication and such, but Rattman changed it so Chell could have a chance at escaping, not just die asleep forever. So, she defeated GLaDOS, then a 'Party Escort Robot' dragged her back inside the facility, into a Long-Term Chamber. But, with GLaDOS gone, there was no power, so Rattman turned on Chell's emergency power, and turning the rest off, keeping her the one one alive. But, Rattman was shot, and bled to death. Then Chell wakes up, and escapes in Portal 2.