 Pinball arcades used to make a lot of money. Players would shovel quarters into the machine for three balls. For an inexperienced player, the game could be over in just a few minutes. But for someone who had good and trained hand-eye coordination, a pinball wizard could play almost indefinitely until the silver ball eventually dropped between the flippers. Even then, a gentle nudge on the machine, not enough to tilt it, could keep the game going even longer.