Why can't you play Uno with Mexicans? They steal all the green cards.
Uno and Green Cards
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Explanation
Experiment
Explain Bear
Listen here, you genius. You probably think that's a good question. But it's not, it's a joke and you're a dum-dum. The 'green cards' in Uno are just playing cards. But the joke makes a silly connection to actual green cards, which are related to immigration status. The joke plays on a stereotype of Mexicans being immigrants and stealing. It's a bit of a sensitive topic, so maybe don't go yelling this in public.