I wasn't blessed with a modicum of sports talent, but I can get behind this idea: cheating.
Baseball King Balls are specially designed polyethylene baseballs from Japan. By making adjustments to that band in the centre of each ball, you can alter their aerodynamics, thereby throwing a sinker, curveball, knuckleball, riser or screwball at will (no special training required!). The catch? There is no catch! Well... other than the obvious fact that these puppies aren't regulation.