"Fifteen Yards! Giving them the business! FIRST DOWN!"

I know they'll sweep it under the whole "unsportsmanlike" umbrella, killing the premise, but all I can hope for is that the gesture that they make the NFL refs do for excessive celebration is an appropriately exaggerated and idiomatic sign. I'd suggest the classic fist pump, (You know, "YYYYYESSS!"), except that's going to be misinterpreted as a face mask. Maybe they can force the refs to do the Ickey shuffle, or mime pulling a Sharpie from their sock. So folks, what is the appropriate gesture for the ref to make?