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I can't in good conscience omit the Pine Tar Incident, though—like Bobby Thompson's shot heard round the world—this event is so storied I don't have much new to say. If you want to learn the details, simply search for “George Brett pine tar” with your favorite search engine.
In short, New York Yankees manager Billy Martin objected to Brett using a bat with too much pine tar and a huge ruffle ensued.
My interest in the event stems from its unique relationship with the idea of cheating. It is unlike many of the other controversies here listed in that there is no question about whether the rule breaking occurred.
What is in question and what is unique about the pine-tar incident is the motive. The pine-tarred bat was probably not a tool for taking advantage of rules and even if it technically constituted cheating, it did not indicate a desire to cheat.
The pine-tar incident has a rich cast of characters, two of whom are worth mentioning as they make appearances elsewhere on the list. Graig Nettles, who some say informed Martin of the rule and Gaylord Perry, who tried to hide the bat to add even more flavor as participants because they were tarnished by separate cheating incidents all their own.