Jokes

Jovi and Corbin currently love telling jokes.  I don't remember how he came up with it, I think Jovi made up a joke and Corbin added a variation, but Corbin's favorite joke is about his stuffed hamster, Squeaky.  "What does Squeaky do when he's bored?"  "He goes ice skating!"  Hilarious laughter ensues.  Sometimes he changes the punchline, aparently Squeaky has lots of options when he is bored, but ice skating is his favorite.  Corbin has never been ice skating, I'm not sure why Squeaky likes it so much.

Jovi's favorite joke was told to her by Laura. 
"Knock, knock"
"Who's there?"
"Interrupting cow."
Interrupting co-"
"MOOOOOO!" (obviously intterupting the previous statement)
There are now many variations on this joke, the interrupting pig, the interrupting duck, the interrupting cheese (introuduced by Juan, the cheese says "Cheese, cheese, cheese!").  They both love any jokes, but those are their favorites.  Jovi is old enough now that she gets most punny (haha) jokes and Corbin will laugh at anything if Jovi does so it is a lot of fun.  Do you have any good jokes to share?