Our son, Peter, has developed a taste for Knock-Knock jokes. He comes up with his own jokes, which he finds hilarious. His most recent creation was:

Knock-Knock…
Who’s there?
Funny!!!
Funny who?

At this point he says “Funny! Funny! Funny!”, puts his thumbs in his ears like moose horns and turns around in a circle while making his own interpretation of Moose noises.

This is followed by lots of laughter as he admires his own sense of humor. We hear this one around the house a lot.