Here are some randomly selected joke topics
Price
The price of duck feathers has just been increased.
This means that now even down is up.
Girlfriends
My other girlfriend is beautiful
Overweight
Overweight just sorta of snacks up on you.
Computers
Unix - Reach out and grep someone.
Thought
I thought of you all day today. I was at the zoo.
Cows
What do you call a cow that just had a calf?
Decalfinated!
Doctors
Doctor, doctor, I keep thinking I'm a snail.
Don't worry, we'll soon have you out of your shell.
Drunks
Everybody should believe in something -- I believe I'll have another drink.
Animals
If we aren't supposed to eat animals, why are they made of meat?