I don't think I have ever seen it happen and I don't think I would really care if it happened. When my kid was younger, her catchers weren't great and her spots were knees and shoulders of the catcher. I'm somewhat with GunnerShotgun on calling the pitches out loud. My kid has pitched many games where she was calling her pitches from the mound. Touching her left ear for a curve, right ear for a screw, forehead for a rise, etc. We didn't quite have the Greg Maddox signals figured out!