Here are some jokes from the book "Just Joking 2":
Knock-knock.
Who's there?
Dwayne.
Dwayne who?
Dwayne the bathtub, I'm dwowning!
What do you call a Frenchman wearing sandals?
Philippe Flop.
Why was the math book sad?
Because it had too many problems.
What did one wall say to the other wall?
Meet you at the corner.
What do you call a person who's afraid of Santa Claus?
Claus-trophobic.
Why was the golfer arrested?
Because he was caught green-handed!
What did the grape do when it got stepped on?
It let out a little wine.