My brother believes that Link from the Legend of Zelda and the Master Chief from Halo hang out at the local Starbucks, reminiscing about the good old days when they had to save the world. They sometimes go back to the Master Chief's house (he decided Hyrule is probably a long way away) and play Super Smash Brothers Melee. Link's favorite character is Luigi (for some reason) and the Master Chief's favortie character is Zelda / Shiek.
He is swearing that the Master Chief will appear in the new Zelda game coming out this fall; the two are apparently old friends that help each other out in each other's games.
A childhood belief about imaginary friends

others believed things like this
- I used to believe that the game The Legend of Zelda: Twilight Princess was the longest game ever.Anon
- I used to think that Christ the royal master leaned against the throne. rather than leads against the foe.Anon
- I used to belive that kids had powers and if you didn't master them quick you'd lose them. — Oliver
- When I was a child I used to believe that when I played video games my real world changed like the game. — J
- I used to think that "Jabberwocky" was a character from Star Wars.— Katya
- I used to believe Jessica Simpson was a secret character from "The Simpsons"— Lemon Jelly