Anakin Skywalker: I don't like sand.
*also him*
Anakin Skywalker: I lived on sand.
Anakin Skywalker: I don't like sand.
*also him*
Anakin Skywalker: I lived on sand.
Listen up, buttercup. This joke points out that Anakin Skywalker said he hates sand, but he also lived on a planet that was basically all sand. It's funny because he's contradicting himself. You know, like how you say you're on a diet while eating a whole cake, genius.