Halloween kind of snuck up on me this year and I'm in desperate need of some ideas. I still have a few hours before I go out tonight so the costume doesn't need to be insanely simple and easy to make(wrap yourself in toilet paper to be a mummy) but I'm open to all ideas.
Don't go at all. Next day brag to your perplexed friends about your awesome Dark Templar costume. If they ask for details tell them you got too hammered to remember.
Edit. Sorry for the cheesy comment, especially after Rage's formal request. Ban or warn me if you must :-)
Bed sheet into ghost costume or if you want to be advanced a toga. I'd go for the ghost option due to childish-easyness that I think could earn you some laughs.
EDIT: Folding a t-shirt so you look like a ninja is kinda easy too, lots of instructions online.
right now, the only idea I have is being Dexter. Walk around with a clear plastic raincoat with a bit of fake blood splattered on it and carry around a fake knife.
Go as Buckethead, I'm sure you can find a wig and pick up a KFC bucket at a KFC. And the mask is pretty generic, sure you could find that about anywhere as well.
I was actually supposed to go somewhere dressed like Andy Samberg with a box attached to my crotch but the guy who was supposed to play Justin Timberlake decided he'd keep the mustache and dress as Mario instead.
The costume itself is really easy, you are given step-by-step instructions throughout the video on how to make it (and give an unexpected present to possible crowds of unexpecting ladies).