"Knock, knock.Who's there?" very long pause... "Java."
Knock knock! Who's there? Yah! Yah who? Naaah, bro, I prefer google.
What do the latest Iphone 6 applications do? Whiten teeth and perform laser eye surgery!
Knock Knock! Who's There? Figs Figs who? Figs the doorbell, it's broken!
Fast way to screw up someone's Knock Knock joke...? "It's open."
Chuck Norris can access the internet from a walkie talkie.
Knock-knock. Who's there? To. To who? No, to whom.
What did the computer do at lunchtime? Had a byte!
Q: How many programmers does it take to change a light bulb? A: None, that's a hardware problem.
Knock Knock! Who's there? Zany Zany who? Zany body home?
Knock Knock! Who's there? Justin Justin who? Justin time for dinner!