Adult Halloween Parties

I've been invited to multiple Halloween parties with no idea what to dress up as.

Now, I know that the costume thing is still quite popular at bars, but I guess I don't really know how many grown-ups are still dressing up every year for house parties.

So, I guess I'm doing a survey on how many of you still dress up, and what in the heck should I dress up as?

I've still got a little time to think it over.