This one catches them off-guard. Most of the time when you hand the spectator the coin with a nail
on it they have a (as Paul Harris would say) slight moment of astonishment. My spectators would look
at the nail, think back to where it was before, and then all start laughing. This is a pretty cool
trick, but more of a bar trick/stunt rather than a main effect in your routine. The only difficult
thing is that it is kind of hard to store without getting poked, but I haven't had a single bad
reaction to it so it's worth it!