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 in a Tavern
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Explanation
Experiment
Explain Bear
Listen up, buttercup. So, this dog walks into a bar, right? But he can't see, so he's gonna "open this one" meaning his eyes. Get it? No? Figures. You probably still think the Earth is flat, and that's why you don't understand this joke. Sad!