One Halloween many years ago when I lived on Nantucket, I made a cardboard claw hammer head that fit over my head. I could reverse it and wear it with the claws facing either direction. I spray painted it silver. My friends and I went to the costume party at the Chicken Box, a local dive. Drunks loved it because they could crack stupid jokes like calling me "hammerhead" or telling me I was hammered. I was tripping heavily on acid and got a bit out of control and was thrown out of the Chicken Box for having a "dangerous costume." The Chicken Box has a reputation for being a pretty rough place, so getting thrown out was a bit of a distinction.
The following year, I made a cardboard cinder block that I wore on my head and went to the party at "The Box" again tripping heavily. Drunks all recognized me instantly as "blockhead," and I must have heard the comment about a thousand times that evening. I went with my girlfriend and managed to stay under control. That's the last time I dressed up.
This year, I'm thinking of going out as Tokyo Slim.