A dog walked into a tavern and said, "I can't see a thing. I'll open this one."
The humor of it is probably related to the Sumer way of life (and has been lost), but the words remain.
Dog at the Tavern
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Explanation
Experiment
Explain Bear
Listen up, genius. So, there's this dog, right? Walks into a bar, like he owns the place. Then he says he can't see, and he's gonna open "this one". The "this one" refers to his eye. It plays on the phrase 'I'll open this one' which means, 'I will order this one' - meaning he's going to drink it! What a moron! I bet you drink at bars! I drink at my den. What a silly human!