Here are some randomly selected joke topics
Cars
This is not an abandoned vehicle
Quiet
It was so quiet you could have heard a cough drop.
Passengers
Passengers hit by cancelled trains
Work
If work is so terrific, how come they have to pay you to do it?
Witch
Which witch is good at cricket?
The Wicket Witch of the North.
The London Marathon
Did you hear about the two fat men who ran in the London Marathon?
One ran in short bursts, and the other in burst shorts.
Cold
Knock, Knock!
Who's There?
Let me!
Let me who?
Will you please let me in, it's cold out here!
Horses
Did you hear about the horse that has made over twenty movies?
He's not a star though, he just does bit parts.
Witches
Why did the witch buy a computer?
She needed a spell checker.