Winner of the Costume Contest (self-declared)

Inspired by an article from the Washington Post, I dressed myself up as a Guantanamo Bay detainee for carnival this year:

....one detainee was wrapped in an Israeli flag and bombarded with loud music in an apparent attempt to soften his resistance to interrogation. (Hattip: JS)

I doubt, however, that the music at Guantanamo Bay is as tormenting as that played in the Rhineland during carnival.

For other great costumes, check out this site, this site and that site.