Baseball is a sport rich in tradition, and many of its most sacred rules and practices are passed from player to player. Onion Sports lists the most revered of baseball's unwritten rules:

  • Never go underneath the catcher's legs when entering the batter's box
  • A manager should be detached from the players and never once talk to or acknowledge them during the regular season
  • When a ball is hit directly up into the sky, it is customary to locate yourself beneath the downward trajectory of the ball and attempt to have it land in your glove
  • Speaking about a perfect game or no-hitter in progress is strictly forbidden; instead, gesture wildly at the scoreboard so your pitcher knows what's at stake
  • Many find it surprising, but there is no rule stating you have to wear a helmet while batting—baseball players are just superstitious
  • Secret of the infield fly rule must be kept from outsiders
  • It's bad luck to speak with a pitcher who is in the middle of his windup
  • If a batter hits a home run, the pitcher is allowed to pelt him with baseballs for the rest of his life
  • In a bench-clearing brawl, do not punch the batboy unless you are an opposing batboy or down more than 10 runs