College basketball once banned dunking because of Lew Alcindor (Kareem Abdul-Jabbar). What will baseball do with Pat Venditte?
For those not so familiar with baseball: Left-handed hitters generally hit better against right-handed pitchers, and right-handed hitters generally hit better against left-handed pitchers. Being able to throw with both arms gives the pitcher a distinct advantage by allowing him or make their decision about which arm to use after the batter steps into the box. Now, throw a switch-hitter into the mix, and you get the "Ring Around the Rosie" game shown above.
Link via Deadspin [1]
[UPDATE]: It turns out there is a rule that takes this scenario into account, and the umps ruled incorrectly [2]. The pitcher has to declare which arm he's going to throw with and cannot change before the end of the at-bat. The batter can change in between pitches.