God, the nail thing, yes. The magician I lived with in Edinburgh was training himself to do it while we were up there, putting vaseline on chopsticks and forrrcing them in; it's just an entirely freakish willpower thing. The trick to it, of course, is that people think your nasal canals go UP when of course they go BACK, so it looks even wronger when you're watching it, though actually it's just a case of making things go in holes that aren't entirely designed to accommodate them. Like anal sex. (Something I imagine DVB is equally impressive at.)