Here are some randomly selected joke topics
Working
When I first started working, I used to dream of the day when I might be earning the salary I'm starving on now.
Knock Knock
Knock, knock.
Who's there?
Frank.
Frank who?
Frank you very much.
Computers
As a computer, I find your faith in technology amusing.
Shopping
Why does a woman say she's been shopping even when she hasn't bought a thing?
Money
Passer-by: What are you digging for?
Workman: Money.
Passer-by: And when do you expect to get it?
Workman: Pay-day.
Idiot
Bill: What kind of idiot do you think I am?
John: I don't know. How many kinds are there?
Brain
Please make sure that your brain is engaged before you put your mouth into gear
Doctors
Doctor, doctor, I keep thinking that I'm a bee.
Buzz off. Can't you see that I'm busy?
Lion
Knock knock
Who's there?
Lionel
Lionel who?
Lionel roar if you stand on it's tail.