One day I was walking around, then saw this mom mad at her kid and screamed, "You're adopted!" He said, "Yeah, I know. My REAL mommy is still at home with daddy."
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Explanation
The humor comes from the kid's unexpected response to being told he's adopted. Instead of being upset, he implies that his adoptive parents are not his real parents, and that his 'real' parents are still at home, turning the insult back on the mom.