One of my favorite lines ever on Cheers occurred when Kevin McHale did one of his two guest spots.

The Cheers gang is conned by Gary's Old Towne Tavern into thinking that McHale had a season-ending injury with a phony x-ray. When McHale walks back into the bar in good health, they hand it to McHale for an explanation. He takes a closer look at the x-ray than they did and says (approximately):

"No, not me. This says 'adult male gorilla.' Could be Laimbeer."