Good God, my father traumatized us when we were young. Videotaped evidence, to boot. Him dressed as Jason Vorhees, chasing us around the yard with a very large (although now you can tell it's very fake) machete. I think I was five. It's funny to watch, though ... first it's heeheehee, look at Daddy, and then it's OMFG SCARY GUY WITH MASK AND LARGE KNIFE I'M GONNA DIIIIIE MOMMMMMMMY!!!