Knock Knock! Who's there? Justin Justin who? Justin time for dinner!
Knock-Knock Who is there? A long penis with a naked head. Come in please we were waiting for you.
Knock-knock Who is there? A shattered penis with many diseases. What kind of illness? Gall, Aids, Gonorrhea, Syphilis... Enough, it is the best present for my mother in law.
Knock knock. Who's there? Cash. Cash who? Yes! I've always known you were a bit nutty!
Knock, knock. Who's there? Kanga. Kanga who? Actually, it's kangaroo!
Knock Knock. Who's there? Opportunity. Don't be silly - opportunity doesn't knock twice!
Knock knock. Who's there? Urine. Urine who? Urine trouble if you don't open the door.
Knock-knock Who's there? Fuck. Fuck who? You.
Knock, Knock Who is there? A long erected penis with an eye on my head and some wools in my feet. What do you want? Is there any body to suck me? I want to weep.
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?"