It's quite ironic that people tell you "Happy Birthday," then they want to give you a spanking.
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Explanation
Explain Bear
Listen up, buttercup. The joke is that people wish you "Happy Birthday," but then they wanna spank you. A spanking, you see, is usually something you get when you're a bad little kid, which is ironic 'cause birthdays are supposed to be happy times. Plus, you're dumb.