The Pine Tar Incident

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Wikipedia - "The Pine Tar Incident (also known as the Pine Tar Game) was a controversial incident during an American League game played between the Kansas City Royals and New York Yankees on July 24, 1983 at Yankee Stadium in New York City. With his team trailing 4–3 in the top half of the ninth inning, George Brett of the Royals hit a 2-run home run to give his team the lead. However, Yankees manager Billy Martin, who had noticed a large amount of pine tar on Brett's bat, requested that the umpires inspect his bat. The umpires ruled that the amount of pine tar on the bat exceeded the amount allowed by rule, nullified Brett's home run, and called him out. As Brett was the third out in the ninth inning with the home team in the lead, the game ended with a Yankees win."
Wikipedia
MLB: BB Moments: The Pine Tar Game (Video)
ESPN - 67: Pine tar nullifies home run, so Brett goes ballistic
NYT: The Pine Tar Home Run By Murray Chass, July 24, 1983
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