A gas station in Bozeman, MT was trying to increase its sales, so the owner put up a sign saying, "Free Sex with Fill-Up."
Soon a local farmer pulled in, filled his tank, and then asked for his free sex. The owner told him to pick a number from 1 to 10. If he guessed correctly, he would get his free sex. The farmer then guessed 8, and the proprietor said, "You were close.The number was 7. Sorry, no sex this time."
A week later, the same farmer, along with his buddy, Ernie, pulled in for a fill-up. Again he asked for his free sex. The proprietor again gave him the same story, and asked him to guess the correct number. The farmer guessed 2 this time. Again the proprietor said, "Sorry, it was 4. You were close, but no free sex this time."
As they were driving away, the farmer said to his buddy, "I think that game is rigged and he doesn't really give away free sex."
Ernie replied, "No it ain't, Elmer. It ain't rigged----- my wife won twice last week!"