Knock-knock. Who's there? To. To who? No, to whom.
"Knock, knock.Who's there?" very long pause... "Java."
Q: Why accountants don't read novels? A: Because the only numbers in them are page numbers.
Knock knock. Who's there? Allahu Akbar. Allahu AK- BOOM!!!
Q: Why do Java programmers have to wear glasses? A: Because they don't C#.
Q: Why was the mole of oxygen molecules excited when he walked out of the singles bar? A: He got Avogadro's number!
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! Ice cream! Ice cream who? Ice cream if you don't let me in!
Chuck Norris was once part of a knock knock joke. The Joke ended abruptly when after the first knock the door blew up killing the man behind it.
If you're not part of the solution, you're part of the precipitate.
A small piece of sodium that lived in a test tube fell in love with a Bunsen burner. "Oh Bunsen, my flame," the sodium pined. "I melt whenever I see you," The Bunsen burner replied, "It's just a phase you're going through."