"Knock, knock." "Who's there?" "You're." "You're who?" "You're adopted!"
You're Adopted
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Explanation
Explain Bear
Listen up, buttercup. The joke is that when someone says "You're" in a "Knock, knock" joke, the other person usually finishes the sentence with a funny name. But in this joke, they say "You're adopted!" which is supposed to be an insult. It's funny 'cause adoption is a sensitive topic, and you're dumb as heck.