Johnny is a RHP and wears glasses. His two grandfathers (one is an optometrist, the other a jeweler) have fabricated a very special pair of glasses for him to wear when he pitches. There's a tiny, convex mirror attached to the inside of the upper-right corner of his right lens. With a simple eye movement, Johnny can get a perfect view of first base and R1, even when Johnny is in the set.
When these same teams played 3 weeks ago, Johnny picked off 3 runners in five innings. After the game, parents of the other team overheard conversation about Johnny's "magic glasses" and passed that info back to their team's coach. Now at pre-game plate meeting (with Johnny warming up to pitch), coach questions you about the legality of Johnny's magic glasses.