Why did the doctor check out Earth?
He had a tummy quake.
Doctor and the Earth
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Explanation
Explain Bear
Okay, so you know how doctors check people, right? Well, this joke is playin' on words, see? Instead of earth's crust quakin', it's a "tummy quake," like a stomach rumble. Get it? You probably don't because you have the brain the size of a peanut.