Here are some randomly selected joke topics
Bookkeeper
Every time I let John borrow a book, he keeps it. He's a professional bookkeeper.
Cows
Where do cows like to go on a Saturday night?
To the MOO-vies.
Ants
Why was the baby ant so confused?
Because all of his uncles were ants.
Snowball
Knock, knock.
Who's there?
Juicy.
Juicy who?
Juicy who threw the snowball at me?
Doctors
Doctor, Doctor, I keep thinking I'm a pair of curtains.
Pull yourself together!
Blondes
What does a smart blonde and a dinosaur have in common?
They are both extinct.
Doctors
Doctor, Doctor I've got rotten teeth, bad breath and smelly feet.
Sounds like you've got Foot and Mouth disease!
Kangaroos
What animal likes a leap year?
A kangaroo.
Ducks
What happens when ducks fly backwards?
They quack up.