We've started working on knock-knock jokes with Cass.
After the standard Banana/Banana/Banana/Orange You Glad I Didn't Say Banana? It was his turn.
C: Knock knock!
M: Who's there?
C: Orange Paper.
M: Orange Paper Who?
C: Aren't you glad I didn't say food?
C: Why did the camel walk on the ceiling?
answer: Because he wanted to leave upside-down footprints!
Of course, it only takes a few more (Vampire grapes! Candy feet! Yellow toast!) to degenerate into poop! and then it's all downhill from there.