Here are some randomly selected joke topics
Elephants
What is grey, beautiful and wears glass slippers?
Cinderelephant.
Doctors
Doctor, doctor, what's the best cure for water on the knee?
A tap on the ankle.
Politicians
Politicians deal with the public on the basis of the mushroom policy: Keep them in the dark and feed them manure.
A Locomotive
What do you get if you cross a locomotive with the author of Tom Sawyer?
A choo choo Twain.
Cowboys
Knock knock.
Who's there?
Ya.
Ya who?
I didn't know you were a cowboy.
Music
If music be the food of love, I need re-tuning
Civil Servants
How many civil servants does it take to change a light-bulb?
Ten. One to mess it up and nine to write the cover-up report.
Fish
What type of fish only comes out at night?
A starfish.
A Rooster
What do you get if you cross a rooster with a duck?
An animal that wakes you up at the quack of dawn.