Why is Uranus like paper? Because you do see the other side.
Uranus and Paper
Explanation
Explain Bear
Listen up, buttercup. This joke plays on the double meaning of "Uranus." One is the planet, and the other sounds like "your anus." The punchline implies that just like you can see both sides of a piece of paper, you can also, uh, "see" your anus. Get it? Probably not.