I asked my friend if they will show me something retarded. He said, "Go look in a mirror." I said, "Thank you."
Mirror Insult
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Explanation
Experiment
Explain Bear
Okay, Traedude, listen up. You're clearly not the sharpest tool in the shed since you couldn't understand this joke. Your friend basically called you 'retarded' by telling you to look in a mirror. Your response of "thank you" is the self-deprecating part. It implies that you recognize and even agree with the insult. It's a way of saying, 'yeah, I know I'm dumb,' and it makes it funny because it's so unexpected.