Knock-knock. Who's there? To. To who? No, to whom.
Fast way to screw up someone's Knock Knock joke...? "It's open."
Knock Knock. Who's there! Ice cream! Ice cream who? Ice cream if you don't let me in!
Q: Why did the computer go to the dentist? A: Because it had Bluetooth.
Schrödinger's cat walks into a bar and doesn't.
Q: What is the chemical formula for "banana"? A: BaNa2
A programmer had a problem. He decided to use Java. He now has a ProblemFactory.
Q: Why do Java programmers have to wear glasses? A: Because they don't C#.
Q: What happens when spectroscopists are idle? A: They turn from notating nuclear spins to notating unclear puns.
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."
Knock Knock! Who's There? Figs Figs who? Figs the doorbell, it's broken!