One time an idiot was at a vending machine. He would stick a quarter in, push the button, a soda would come out and he would put it on top of the machine. He did this a few more times before a man asked why he kept doing this, and he said, "Because I'm winning."
Here are some randomly selected joke topics
Dogs
Where did the dog breeder deposit his savings?
In Bark-lays Bank.
Man
Did you hear about the man put on a clean pair of socks every day of the week.
By Friday he could hardly get his shoes on.
Girlfriends
Boyfriend: Is that a new perfume I smell?
Girlfriend: It is, and you do!
Police
What do the police call it when they watch a vampire's castle?
A stake out.
Frogs
What do you call a girl with a frog on her head?
Lily.
Buffalo
What did the buffalo say when he dropped his boy off at school?
"Bye, son!"
Wedding
Wedding - a funeral where you smell your own flowers.
Cows
What goes oom, oom?
A cow walking backwards.
Soup
Diner: How's your chicken soup today?
Waiter: It's pretty fowl.