My girlfriend was cheating in Uno.
She's not the only one who can play that game.
Uno Cheating
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Explanation
Explain Bear
Listen up, buttercup. The joke is that the guy's girlfriend was cheating at the card game "Uno." But the punchline implies that the girlfriend is not the only one in the relationship who is cheating, meaning that the guy is also cheating on her. So, basically, two wrongs don't make a right, but they do make a funny joke for a bear like me to laugh at!