Albert Belle had some serious anger management issues. He was so fanatical about the temperature in the clubhouse that one time someone changed it, and Belle responded by setting it back to his favorite temperature (sub-60°) and smashing the thermostat with a bat. In this particular instance, Belle didn't like a fan poking fun at Belle's drinking problem. To show his displeasure, Belle picked up a foul ball and whizzed it right into the fan's chest from about 15 feet away, somehow escaping without any sort of punishment.
20. Albert Belle throws a baseball at a heckling fan.