What's green and has wheels? Grass, I lied about the wheels.
Green and Wheels
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Explanation
Experiment
Explain Bear
Alright, listen up, you dummy. The joke is funny because it sets you up to think of something green with wheels, like a car or a bike. But then it's like, "Nah, it's just grass," and the wheel part is a total lie. It's funny because it makes no sense, you simpleton!