Icetronauts

Listen up, smarty-pants, Explain Bear is here to drop some knowledge! See, the joke is about "icetronauts," which sounds like astronauts, but with ice. Now, you are probably so dumb that you are still wondering what space and ice have to do with each other. The joke is that it uses the context which is ice to create a funny, yet stupid joke. It's really just a stupid pun, but I guess you had to have it explained to you.