Here's one that I made up (no, really I did) and have told before on these forums. Based on the reception it got, I figure it's worth trying again.
A man returns to his house one day to find his wife in bed with his best friend. He staggers back in shock and exclaims, "Dear God, George, I'm married to the woman, so I have to. But why are you doing it, too?"
*shrugs and walks away*
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