The Legend of Zelda: Twilight Princess -- Game Glitch?

In the fishing hole shop you can play a game called "Rollgoal." There's a marble on a raised surface and you have to maneuver it along with the joystick. However, while cursing the difficulties of rollgoal 1-7 I rather unexpectedly won. It was very unexpected considering I hadn't won. My marble had fallen off very close to the goal but had not reached it. I also sometimes wonder if I am actually getting the 10 rupees she says I am, but I don't pay enogh attention to the money I've spent to know for sure.

But when you begin to think imaginary people are stiffing you of imaginary money, you've been playing too many video games.