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