Ususally I'm sitting on the porch dressed as Frankenstein or a faceless phantom or something in front of a big bowl of candy. When the kids come up they think noone is watching so they'll take as much as they want. When they go to get the candy, I'll grab a hand or go BOOOO or something. I'm not cruel....there is an age limit (no kids under 6 or so) but they usually get the crud scared out of them. It has happened that I've got quite a few parents too....