Knock, knock. Who's there? Kanga. Kanga who? Actually, it's kangaroo!
Knock, knock. Who's there? Owls say. Owls say who? Yep, that they do.
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? Doctor Doctor who? That's a great TV show, isn't it?
You said it was a great horse and it is. It took twenty other horses to beat him!
What do you get when you cross a frog and a rabbit? A rabbit that says, "Ribbit."
Knock, knock! Who's there? Opportunity! That is impossible. Opportunity doesn't come knocking twice!
I went to the movie theater the other day and in the front row was an old man and with him was his dachshund. It was a sad, funny kind of film. In the sad part, the dachshund cried his eyes out, and in the funny part, the dachshund laughed its head off. This happened all the way through the film. After the film had ended, I decided to go and speak to the man. "That's the most amazing thing I've seen," I said. "That dachshund really seemed to enjoy the film." The man turned to me and said, "Yeah, it is. He hated the book."
Q: Why can't you tell blondes knock-knock jokes? A: Because they leave to go answer the door.
Knock, Knock! Who's there? D umbbell. Dumbbell who? Dumbbell doesn't work so I had to knock!
Knock Knock! Who's There? Figs Figs who? Figs the doorbell, it's broken!