Here are some randomly selected joke topics beginning with the letter 'K'
Kangaroos
What do you get if you cross a kangaroo with a line of people waiting to catch a bus?
A queue jumper.
Karate
How do you know that Santa is good at karate?
Because he has a black belt!
Kangaroos
What do you get if you cross a dog with a kangaroo?
A dog that has somewhere to store its own lead.
Keep
What can you keep even though you have given it to someone?
Your word.
Kangaroos
What animal likes a leap year?
A kangaroo.
Kangeroo
What do you get if you cross a tiger with a kangeroo?
A stripey jumper.
Kennel club
What does a dog use for playing golf?
A kennel club.
Karate
Did you hear about the karate champion who joined the army?
The first time he saluted, he nearly killed himself.