The Art Of Joke Telling

Leo has reached the stage where he is trying to master the art of joke-telling.  jb and I are both participating in a LOT of nonsensical knock-knock jokes.  He's also testing out various silly statements to see if they illicit a laugh.  Often they do, but usually from the comedian himself.  Here he is telling the classic: "Did you know hippos eat elephants?" one-liner.