When you split Uranus in half, it is "ur-anus." That's why it has a butts joke. Weird.
Split Uranus
Categories
Explanation
Experiment
Explain Bear
Listen up, buttercup. This joke works because Uranus sounds like "your anus." Get it? It's wordplay using the planet's name to make a childish joke about butts. I bet you think farts are still funny. The joke depends on how you pronounce Uranus.