when given the option of becoming anything you want for an hour, you of course choose the scariest thing possible. but then if the birthday girl is so genuinely terrified that she screams at the sight of you and avoids you for the rest of the party, the fun sort of goes right out of it. later, there's the novelty of presenting yourself to your family, maybe posing for a few photos. but let's face it. too much attention gets wearisome quickly, and makeup of the sort that hides your true identity is uncomfortable. time for a wet washcloth and some legos.