To root the opener you can say"I got a bet with a buddy, and need a joke to get a free beer."
It also helps if your able to tell a few jokes yourself. Here's a few:
Two muffins were in an oven, one muffin says to the other ":it's really hot in here." The other muffin says "Holy crap! a talking muffin!"
NASA first started sending up astronauts, they quickly discovered that ball-point pens would not work in zero gravity. To combat this problem, NASA scientists spent a decade and $12 billion developing a pen that writes in zero gravity, upside-down, on almost any surface including glass and at temperatures ranging from below freezing to over 300 C. The Russians used a pencil. Your taxes are due again--enjoy paying them.
"They keep talking about drafting a Constitution for Iraq. Why don't we just give them ours? It was written by a lot of really smart guys, it's worked for over 200 years and hell, we're not using it anymore
Whose cruel idea was it for the word "lisp" to have an "s" in it?
Why is it that if someone tells you that there are 1 billion stars in the universe you will believe them, but if they tell you a wall has wet paint you will have to touch it to be sure?
If love is blind, why is lingerie so popular?
Why is the man who invests all your money called a broker?
If you take an Oriental person and spin him around several times, does he become disoriented? [this is for a friend of mine from that ancestry

THREE PROOFS THAT JESUS WAS PUERTO RICAN
His first name was Jesus
He was bilingual
He was always being harassed by the authorities
THREE PROOFS THAT JESUS WAS ITALIAN
He talked with his hands
He had wine with every meal
He worked in the building trades
THREE PROOFS THAT JESUS WAS BLACK
He called everybody "brother"
He liked Gospel
He couldn't get a fair trial