An amateur bets Arnold Palmer that he can beat him over 18 holes of golf so long as he gets 5 strokes start and two "gotchas".

Arnold Palmer doesn't know what a "gotchas" is, but hey, the guy's an amateur. He will be easy to beat, so Arnold accepts the bet.

After 6 holes Arnold Palmer has made up the 5 strokes start and reckons he has it made, but when he is putting on the 7th, the amateur comes up behind him and without warning shouts "Gotcha!", reaches between Arnolds legs and administers a violent "gotcha". ( do I have to be more explicit?)

For the rest of the round Arnold Palmer’s putting goes to pieces because he’s waiting for the second gotcha. The amateur wins.