Here are some randomly selected joke topics
Fail
I could not possibly fail to disagree with you less.
Grandma
Dad, there's someone at the door collecting for the old folks home. Shall I give him grandma?
Possessed
"You have reached 555-5678, DIAL-A-DEMON. At the sound of the tone you will be possessed."
Cats
Why was the cat afraid of the tree?
Because of its bark.
Dieting
Diet doctor: a man whose patients are wearing thin.
Biscuits
Why do stupid people eat biscuits?
Because they're crackers.
Succeed
If at first you don't succeed, have you considered becoming a personnel officer?
Waiters
Waiter, waiter what's on the menu tonight?
I'm not sure, sir, but it looks like last night's special.
Farmer
Why did the farmer ask the vet to examine his cow?
Because she was so mooo-dy.