Here are some randomly selected joke topics
Guitars
Why pick on guitars
Mistakes
Computers make very fast, very accurate mistakes.
Great Britain
Who is Great Britain's data compression hero?
Jack the Zipper
Owl
Knock, knock.
Who's there?
Owl.
Owl who?
Owl aboard!
Exam
What is black and white and hard all over?
An exam paper.
Soap
Customer: I'd like a bar of soap please.
Shop Assistant: Would you like it scented?
Customer: No, I want to take it with me now.
Computers
If a listener nods his head when you're explaining your program, wake
him up.
Ducks
Where does a duck go when he gets sick?
The ductor.
Sheep
Where do sheep buy their Christmas presents?
They go to Wool-mart!