Here are some randomly selected joke topics beginning with the letter 'C'
Cats
What swings from a trapeze and miaows?
An acrocat.
Cats
Purranoia: the fear that your cats are plotting against you.
Cats
What do cats like to eat for breakfast?
Mice Crispies.
Catch
What do we often catch but never see?
A passing remark.
Cats
When should a mouse carry an umbrella?
When it's raining cats and dogs.
Cats
Joe: I've got a cat who can say his own name.
Bob: That's great! What's your cat's name?
Joe: Meow!
Cats
What do you call a cat with eight legs that likes to go swimming?
An octopuss.
Cats
What do you call a cat who likes to eat lemons?
A sourpuss!
Cats
Patient: I think I'm turning into a baby cat.
Doctor: I think your just kitten me.