Here are some randomly selected joke topics
Doctors
Doctor, doctor, I've got a little sty.
Well you'd better buy a little pig for it then.
Cars
What do you call a person who draws amusing pictures of motor vehicles?
A car-toonist.
Listening
Of course I'm listening to you don't you see me yawning?
Cows
Q: What do you call a cow that's just had a baby?
A: Decalfinated
Ghosts
Why is a ghost like a cold breeze?
Because it makes people shiver.
Golf
What goes 'putt, putt, putt, putt'?
A poor golfer.
Answer
Knock, knock.
Who's there?
Major.
Major who?
Major answer, didn't I?
Skeletons
Why do skeletons hate the winter weather?
Because the cold goes right through them.
Lemons
Why did the lemon refuse to argue with the orange?
Because it was yellow.