"Can you tie a knot?"
"I cannot."
"So you can knot?"
"No, I cannot knot."
"Not knot?"
"Who's there?"
"F... off!"
"Can you tie a knot?"
"I cannot."
"So you can knot?"
"No, I cannot knot."
"Not knot?"
"Who's there?"
"F... off!"
Alright listen up, chucklehead. This 'Not knot' thing? It SOUNDS like "knock knock." See, the dude is tricking the other dude into starting a knock-knock joke, then he insults him with a big ol' "F off!" You probably think that's sophisticated humor, don't you? Pathetic.