Knock, knock; Who is there? Love; Love who? U, U, U!
Knock-knock Who's there? Fuck. Fuck who? You.
Knock,Knock, Who is there? Pen! Pen who? is...
Knock Knock! Who's there? Testicules. Testicules who? Pillow for penis .
Did you hear about the guy who invented the knock knock joke? He won the "no-bell" prize!
Knock knock Who's there? Double. Double who? W!
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 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.
Knock, knock Who's there? I'm Mr, Farter. Mr, Farter who? I've brought some insecticides to give to your mother in law!