Here are some randomly selected joke topics
Teachers
Teacher: "What is the outer part of a tree called?"
Pupil: "I don't know sir."
Teacher: "Bark, boy bark."
Pupil: "Woof-woof."
Ice Cream
Knock, knock.
Who's there!
Ice cream!
Ice cream who?
Ice cream if you don't open this door!
Astronomers
How many astronomers does it take to change a light bulb?
None. Astronomers prefer the dark.
Managers
The manager started his speech at 10 a.m. sharp and ended at 11 a.m. dull.
Football
Where do footballers dance?
At a football.
Thieves
A gang of thieves broke into a blood bank last night and stole a hundred pints of blood. Police are still hunting for the clots.
Doughnuts
Old doughnut makers never die,
they just get tired of the whole business.
School
Teacher: You missed school yesterday, didn't you?
Henry: No. Not even a little bit!
Scottish
What did the pine tree say to his girlfriend?
I'm fir you.