I have a phobia about costumes. Seriously. The yearly Halloween party is my least favorite night of the year; my best friends host it, and it is by all accounts a great party, but I spend most of it by myself in an old Adirondack chair in the back yard, no matter how cold. One year when It rained, I just went home. I keep going back because my wife loces it.
Don't what triggers this in me, but it's one of the worst things I can imagine, having to make small talk with someone dressed as, I don't know, Beetlejuice?