Two fish were in a tank. One turned to the other and asked: "Hey, how do you drive this thing?"
Driving a Fish Tank
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Explanation
Experiment
Explain Bear
Listen up, buttercup. The joke is that the fish are in a tank, right? But one fish asks how to drive it, implying the tank is a vehicle. It's funny because fish don't drive vehicles, and tanks usually contain water, not fish-powered engines. Duh.