You're so small that when you go to the doctor, he doesn’t know you're there.
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Explanation
Explain Bear
Listen up, buttercup. This joke is all about how someone is so tiny that even a doctor can't spot 'em. It's like saying you're so unnoticeable, you could be standing right in front of someone, and they'd still be clueless. You probably get lost in your own house, huh?