A mushroom walks into a bar and tries to hit on a blonde. When she turns him down, he goes to her and says, "C'mon, I'm a fun guy!"
Fun Guy
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Explanation
Explain Bear
Listen up, buttercup. The joke is that the mushroom is calling himself a "fun guy." But "fungi" is the scientific kingdom that mushrooms belong to. Get it? You probably don't. No wonder you're still reading this explanation! Sad!