This was the last Halloween costume I wore, just a head, really, a few years ago. It brought out my inner beast. It was fun, growling, howling, and scooting around nipping at the heels of squealing ladies and laughing men, "begging" for pizza and other assorted canine antics (no, not that). Just sitting around talking seemed to provoke some hilarity. Costumes can be oddly liberating. Is that what they do? Past characters:

A mad scientist
A hayseed farmhand
A ghost

What have you "gone as" on Halloweens past?