In Vegas about 12 years ago (pre-Anchorman) I saw these 4 knuckleheads dressed up as a 1970's Formula One Driver and his "crew". The gag started with his "crew" running around keeping everyone 15 feet away from their "driver" as he played and sat at the bar. Obviously, no one was trying to get near the doof. But therein lay the brilliance! Because, within about 15 minutes, people started playing along and within 20 minutes the "driver" started to send his "team" to ask the hottest girls to come have a picture and autograph taken with him. He had them sitting on his lap and signed their cleavage while their boyfriends/husbands looked on and took photos. Incredible.

I have dibs on this one for next year.

every time I looked at him I could't stop laughing, lol. I still laugh about it.

About 25 or so years ago I saw three guys dressed up as dobie.  They were the doubie brothers.  Showing my age but it is still the funniest costume I have seen.