Kirk Lazarus: Everybody knows you never go full retard.
Tugg Speedman: What do you mean?
Kirk Lazarus: Check it out. Dustin Hoffman, Rain Man, look retarded, act retarded, not retarded. Counted toothpicks, cheated cards. Autistic, sho'. Not retarded. You know Tom Hanks, Forrest Gump. Slow, yes. Retarded, maybe. Braces on his legs. But he charmed the pants off Nixon and he won a ping-pong competition. That ain't retarded. Peter Sellers, Being There. Infantile, yes. Retarded, no. You went full retard, man. Never go full retard. You don't buy that? Ask Sean Penn, 2001, I Am Sam. Remember? Went full retard, went home empty handed...
Moviegoers love the mentally challenged. Or rather, the quirky, innocent versions who show up in one inspirational movie after another. To take home the gold you need to play the kind of mental handicap that just makes you quirky — or even better, gives you special powers somehow. You can't actually show audiences what life is like for these people. Who the fuck wants that?
—Adam Brown, Cracked.com editor, 6 Cheap Acting Tricks That Fool The Critics Every Time (#2: Get Retarded!).
The diseased/addicted/mentally impaired always get the Oscar.
— Hollywood Rule Book, Vanity Fair