My friend had a Harry Potter themed birthday party (she's probably the biggest fan I've ever seen). Costumes were encouraged, but since I'm already working on stuff for SDCC...I had no time to make something. So, I went as a rabid Draco fan girl/pretend hipster. But, of course, when I got there no one else had dressed up as anything, which happens to me a lot. Almost every party my friends have in fact. (The Ghoulie in the back had dressed for a different party and left about 5 minutes later..)
Anyway, I'm the crazy one on the bottom left: