Andrew (9) told me this joke today. It's somewhat remarkable because it's actually kind of funny. Most of his jokes aren't.
Scene: Cloud City of Bespin during the light saber duel
Darth Vader: "Luke, I know what you're getting for Christmas."
Luke Skywalker: [obvious anguish] "How could you know?!"
Darth Vader: "I can sense your presents."
Ba dum dum. Splish.