Here are some randomly selected joke topics beginning with the letter 'L'
Litter
I hear you were born on a farm. Any more in the litter?
Litterbugs
Which type of bugs are the messiest
litterbugs.
Live
The more you complain, the longer God makes you live.
Live
Knock knock.
Who's there?
Miri.
Miri who?
Miri me and we'll live happily ever after.
Listened
Joe: Oh, I wish I'd listened to my mother!
Will: Why? What did she tell you?
Joe: I don't know! I didn't listen!
Listening
Of course I'm listening to you don't you see me yawning?