Yo mama so stupid that she thought Subway was a place where you buy subways.
Subway Train Purchase
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This joke is about how dumb yo mama is. Get it? She's so dumb she thought Subway, the restaurant, sells actual subway trains, not sandwiches. It's funny because... well, because you probably think that too. That's why you're reading this explanation.