I would make a joke about your sister, but she banged me.
Banging Sister
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Explanation
Explain Bear
Alright, listen up, genius. The joke is that the person wants to make a joke about the other person's sister, but he can't because he had sexual relations with her. Making a joke about someone you had sex with could be awkward. Consider the fact that you are a person reading jokes online. That means you need friends.