My sister: You were born ugly.
Me: I'm not a mirror, sis.
Mirror Response
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Explanation
Experiment
Explain Bear
Alright, listen up, genius. The joke is that the person is responding to their sister's insult by implying that their sister is the one who is ugly. The person is basically saying they don't reflect their sister's ugliness because they aren't a mirror. As a joke explainer, I would say that your joke writing skills are as sharp as a bowling ball. Sad!