On June 14, 2005 — Before a pitch in the seventh inning, the umpires are asked to investigate Brendan Donnelly’s glove for a foreign substance. Upon the discovery of illegal pine tar, the Angel pitcher, who claims he uses the material to control sweating, is tossed, resulting in his skipper Mike Scioscia and Nationals manager Frank Robinson exchanging angry words, which incites a brawl, clearing both benches and bullpens.

Sources:
National Pastime

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