A man is driving down the freeway when he sees a sign that
says; "Get gas and free sex here". So obviously the guy was
interested, so he stopped, filled up went inside to pay.
"Pick a number from 1 - 10 to get free sex." said the cashier. 
"Uh, okay, 3!" the man replied.
"Nope! Sorry play again".
So the guy drove around for weeks always getting gas at the
same place, because he wanted his free sex. One day he was
really ticked:
"This has got to be rigged! I have never gotten the number to
have free sex!" He screamed.
"Oh no! It's not rigged, just ask your wife, she won 3 times
last week alone!"