Here are some randomly selected joke topics
Teachers
In school I was the teacher's pet.
She couldn't afford a dog.
Dogs
What do you call a sheepdog's tail that can tell tall stories?
A shaggy dogs tale.
Taxidermist
Did you hear about the idiot who thought a taxidermist was someone who stuffs dead cab drivers?
A Monk
What did the monk say when he returned to his monastery on completing a trip round the world?
The world is my cloister.
Mind
Out of my mind. Back in five minutes.
Snowball
Knock, knock.
Who's there?
Juicy.
Juicy who?
Juicy who threw the snowball at me?
Water
Save water - dilute it
Elementary
Knock, knock.
Who's there?
Elly.
Elly who?
Ellymentary, my dear Watson.
Dating
Did you hear about the dating agency for chickens that went bankrupt last week?
They couldn't make hens meet.