My mom walks in a bar and the bartender says "water?" saying "we only sell beer!"
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Explanation
Explain Bear
Okay, listen up, dummy. The joke is that the bartender is being a smart aleck. He knows it's a bar, so he's acting surprised that someone would ask for water instead of beer. It's like you asking if the sky is blue – duh! You're about as sharp as a marble, ain't ya?