Major League Baseball umpires are required to wear black underwear in case their pants split during a game

Major league pitchers are allowed to switch their throwing arm in the middle of an at-bat, but only if they have injured the other one

Instead of crouching, catchers stood a few feet behind home until the early 1900s

The term "can of corn" (an easy-to-catch fly ball) relates to an old-time grocer's method of getting canned goods down from a high shelf by catching them in their aprons

Only one major league ballplayer has been fatally injured during a game. Cleveland Indians shortstop Ray Chapman was killed when struck in the head by a pitch on August 16, 1920

To keep cool during games, Babe Ruth placed chilled cabbage leaves in the underside of his cap