Knock, Knock! Who's there? D umbbell. Dumbbell who? Dumbbell doesn't work so I had to knock!
One day a man heard knocking at his door. He opened the door only to see a small snail sitting there smiling. The guy picked the snail up and threw it as far as he possibly could. Three years later he heard knocking at the door again. He opened the door to see the snail. The snail said, "What the hell was that all about?"
Knock-knock. Who's there? To. To who? No, to whom.
Knock knock Who's there? Double. Double who? W!
Knock, knock. Who's there? Nobel. Nobel who? No bell, I knock.
Peter approaches the gates of Heaven. "Knock knock," says Peter. Miraculously, someone answers him. "Who's there," a voice in the distance asked. "God," says Peter. "God who," asked the voice? "GOD DAMMIT open these gates! I've been a good neighbor, loved my wife and lost my virginity, twice!"
Knock Knock! Who's there? Justin Justin who? Justin time for dinner!
Knock, Knock! Who's there? Doctor Doctor who? That's a great TV show, isn't it?
Knock knock! Who's there? Yah! Yah who? Naaah, bro, I prefer google.
Knock-Knock Who is there? A long penis with a naked head. Come in please we were waiting for you.