Claustrophobic Astronaut

Listen up, buttercup! This joke is about an astronaut who's claustrophobic, meaning he's scared of small spaces. The punchline is that he needs "space," which is a play on words because astronauts are, like, always in space, but he needs physical space, too, because he is locked in a capsule. Get it? Space...because he's an astronaut? And you're a dummy!