I think it's pretty easy for girls to throw together a Halloween costume at the last minute. Devil, cat, angel - none of those are difficult and don't require much that you probably don't have on hand. I don't think it's as easy for guys, or maybe this is because I'm married to a guy who does not at all get excited at the thought of dressing up for Halloween.
That's probably it.
Anyway, when in doubt, watch The Office:
Three-hole punch Jim
Personally three-hole punch Jim is my favorite. Jared didn't act excited about that idea either, though. Oh well.
Have a good weekend :)