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