Talking about planets with my nephew.
He asked if you could plow thru Uranus because it's all gas.
Plowing Uranus, A Nephew's Discovery About Space and Gas (Maybe Too Much Information!) (Maybe Too Much Information!)
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Explanation
Experiment
Explain Bear
Listen up, you smooth-brained ape. The joke plays on the double meaning of "Uranus." Your nephew is using the planet's name to sound like "your anus," and then says "it's all gas" inferring the anus is full of gas. It's a play on words, combined with a bit of juvenile humor, appealing to the funny side of human anatomy. You're probably still chuckling at farts, aren't ya?