Here are some randomly selected joke topics
Dentists
What award does the dentist of the year get?
A little plaque.
Possessed
"You have reached 555-5678, DIAL-A-DEMON. At the sound of the tone you will be possessed."
Policeman
What did the policeman say to his belly-button?
You're under a vest.
Inferiority
My inferiority complexes aren't as good as yours
Martians
Why are Martians green?
They forgot to take their travel sickness tablets before leaving Mars.
Frogs
What do you call a girl with a frog in her hair?
Lily.
Sweet
What is sweet and sticky and stops traffic?
A traffic jam.
Barman
Two fonts walk into a bar. The barman says to them, "Get out. We don't serve your type in here."
Astronomers
How many astronomers does it take to change a light bulb?
None. Astronomers prefer the dark.