[Vulture] William Zabka, who played the bad guy in "The Karate Kid", had a great Halloween costume: The Bad Guy in "The Karate Kid"!
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 the original...
If you're pressed for a Halloween costume, this is pretty awesome: You can be Jack Skellington from "The Nightmare Before Christmas" using nothing but black and white makeup.