Stripper who?

Alright, listen up, buttercup. This is a knock-knock joke, which means it follows a specific pattern. The setup is "Knock knock! Who's there?" and then someone says a name. You repeat the name and say "[Name] who?" and then the person tells a joke that involves the name they said. In this case, it's a stripper and the punchline is "Stripper down" which sounds like "Strip her down". You see, it's funny because strippers strip! What are you, dense?