"What.. is the difference between a fish, and a piano?"
"Oh gee I dunno Fozzie, what's the difference between a fish and a piano?"
"You can tuna fish... but you can't tune a piano!"
"But Fozzie, you CAN tune a piano!"
"I'd like to see YOU try! Wakka wakka!!"
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this joke, obviously, doesn't work if you tell it to someone who actually knows how to tune a piano
