Children of the world, don’t believe your parents, your shrinks, or your imaginary friends: worst nightmares sometimes do come true. Sure, many humans can get through their entire lives without falling out of an airplane, having a leg eaten off by a shark, being kidnapped by a tiny car full of saber-toothed circus clowns, or being awoken at 2 a.m. by a group of drug-crazed hippies wielding ice picks and chanting “Kill the pig, acid is groovy.” But some don’t. We all have these fears and they are perfectly rational, so watch out.