Doo Doo the clown. If you're not afraid of clowns, you might know someone who is. Several celebrities, for instance, are decidedly anti-clown: Johnny Depp had nightmares of clowns as a kid, and, of course there's Bart Simpson, who said, "Can't sleep, clown will eat me." Clowns like Bozo and Ronald McDonald are, without a doubt, the "Oh, my God—that clown's kind of freaky!" clowns. And then there's the story of John Wayne Gacy,......