My mom said, "Why did I adopt you?"
I said, "Because the other three were mistakes."
Reason for Adoption
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Explanation
Experiment
Explain Bear
Listen up, buttercup. The joke here is that the person being spoken to was adopted because they were, in the eyes of their mom, better than the biological kids. But the speaker implies they know they were adopted, so they make a joke that the mom's other kids are mistakes. Get it? Probably not.