Here are some randomly selected joke topics
Human
To err is human, to moo bovine.
Newspaper
Printed in a newspaper - Hugh and Ruth went to grammar school together and their marriage will stop a romance begun between them there.
Knock Knock
Knock, knock!
Who's there?
Doughnut.
Doughnut who?
Doughnut keep me waiting here!
Wife
My wife is a great lover - of cream cakes.
Chilli
How do you make a Mexican chilli?
Take him to the North Pole.
Work
Dave: Do you like going to work?
Patrick: Yes. And I like going home, too. It's the part in between that I hate.
Insects
Which insects are the most loyal?
Ticks. Once they find a friend, they stick to them.
Teachers
Old teachers never die. They just lose their class.
Candle
What did the big candle say to the little candle?
You're pretty bright for such a little guy!