Crying
Knock, knock.
Who's there?
Boo.
Boo who?
Don't cry, it's only a joke.
Graveyards
Why did they have to put a fence around the graveyard?
Because people were dying to get in.
Teachers
I went to high school for so long that the other students brought me apples. They thought I was the teacher.
Sherlock Holmes
Did you hear about the detective who became famous after solving crimes by pure chance?
He was called Sheer - Luck Holmes.
Fired
My brother said, 'I want a job as a human cannonball.'
I said, 'I'll bet you get fired.'
Elephants
What is big, grey and far too dangerous to appear in a circus?
An elephant with a machine gun.
Lemons
Why did the lemon refuse to argue with the orange?
Because it was yellow.
Girlfriends
My last girlfriend was so ugly that when she worked in a pet store, people kept asking how big she would get.
Boxers
How do you get a boxer to laugh?
Start telling a joke and then hit him with the punchline.