Pushing the Lines: Modern Fantasy

He saw two hands reaching faintly for the penny slipping from his fingers. One hand caught the penny, the other hand missed and fumbled to dig into the ground. He squinted, and he saw the penny being caught by the beggar just as a sneeze wracked him. "Wow," he breathed, awed. There was only one hand, now, the hand of the beggar holding the penny. It was the first time that he manipulated the fate lines, but not the last. The next time was at a test when he just couldn't think of the answer to the question, and he knew that if he got it wrong, his dad would be incredibly pissed at him. He squinted. If he unfocussed his eyes just a little, he could--

Inspiration: Random idea that came to me in the shower.
Story Potential: High potential, I think. Not "Eureka!" high, but an interesting concept to be played around with.
Notes: He can push the fate lines around, see the probabilities and move himself (or others) to the luckier--but every action has an equal and opposite reaction. This idea could play any number of ways, from coming-of-age to dark horror to superpower comic-book style.