John McEnroe Joke

I was watching an episode yesterday where Bear was in the jungle trying to smoke bats out of a cave. He had made a makeshift net out of sticks and vines and was swinging at them like a tennis racket when they flew out, trying to knock the out. He wanted them for food, of course. While he was doing this, he yelled "You cannot be serious!".

This cracked me up because I really miss the old days of tennis when there were more various styles of play and more personalities on display. I wonder how many people got the joke?