A Kiwi emigrates to Oz and opens up a petrol station. To increase its sales, he put up a sign saying, 'Free sex with Fill-Up.'
Soon a local, Bill, pulled in, filled his tank, and then asked for his free sex.
The Kiwi told him to pick a number from 1 to 10. If he guessed correctly, he would get his free sex.
Bill then guessed 8, and the Kiwi said, 'You were close. The number was 7. Sorry, no sex this time.'
A week later, Bill and his mate Bluey pulled in for a fill-up at the same station. Again Bill asked for his free sex.
Again he got the same story, and asked him to guess the correct number. Bill guessed 2 this time.
Again the Kiwi said, 'Sorry, it was 4. You were close, but no free sex this time.'
As they were driving away, Bill said to his mate Bluey, 'I think that game is rigged and he doesn't really give away free sex.'
Bluey replied, 'No it ain't Bill. It ain't rigged -- my missus won twice last week.'