Banana in the ear

Dialogue between Bert and Ernie

Bert: "Hey, you've got a banana in your ear!"
Ernie: "What?"

Bert: "I said, YOU'VE GOT A BANANA IN YOUR EAR!"
Ernie: "What? I can't hear you; I've got a banana in my ear!"

Bert: "Hey, you've got a banana in your ear!"
Ernie: "I know, I'm keeping the alligators away."

Bert: "But there aren't any alligators on Sesame Street!"
Ernie: "I know, it's working!"

This conversation (modified for his purposes) was also told by Father Anthony in one of his talks to show the nature of most of his conversations! :)