Here are some randomly selected joke topics beginning with the letter 'L'
Labor
Heavy labor is aardvark ... but it pays well
Lady
"Who was that lady I seen you with last night?"
"You mean 'I saw.'"
"Ok, who was that eyesore I seen you with last night?"
Landlord
The landlord said he wanted me to treat the place like my own home. So I did - I didn't pay the rent.
Laryngitis
What do you call a veterinary surgeon with laryngitis?
A hoarse doctor.