What's big, green, has four legs, and if it falls out of a tree, it can kill you?
A pool table.
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Explanation
Explain Bear
Alright, listen up, buttercup. So, the joke sets you up to think of something alive and dangerous falling from a tree, right? Like a big ol' animal or somethin'. But BAM! It's a pool table. Pool tables ain't supposed to be in trees, dummy! And yeah, they're heavy, so if that sucker fell on ya, you'd be flatter than a pancake. The humor comes from the surprise, you walnut.