Why Don't You Laugh?

Mrs. House Spouse again. Just wanted to share a funny story about Andy Kristopher. He is always telling jokes, but his jokes typically go something like this: "Knock, knock" to which we reply, "who's there?" and he replies, "Banana (or words to that effect)," "Banana who?" "Banana, blah, bah, blah (literally those words exactly)."

To adults, this is not very funny, but apparently Andy seems to think it should be because he typically says, "why don't you laugh? You are supposed to laugh at jokes."

I guess his humor runs on Rusty's side, because Rusty typically has to explain his jokes and why they are supposed to be funny.