This has to be one of the most creative pop culture Halloween costumes I've ever seen...even though it's so obscure that nobody's going to get it: Some guy dressed up as "The End of the Credits of 'Cheers'."

He dressed up as a guy in one of the old-timey photos from the credit sequence and he made a transparent sign with the text that appears in front of the guy in the credits.

Here's his photo, and a still of the original:

Here's the opening credit sequence. The subject of the costume appears 52 seconds in.