Jonah Hill
The shirt's image comes from an Austin mural drawn by bipolar artist/singer Daniel Johnston, and bears the title of his debut album. ''I got it in Austin, my favorite town in America,'' says the Superbad star. ''It's just such a fun creature. I know Matt Groening was really influenced by him. You can see, if you look at those rabbits Groening drew, he thought Daniel Johnston was cool.''