On May 20, 2006 — After barreling over fellow catcher Michael Barrett in a play he considered hard but clean, A.J. Pierzynski is surprised when the Cub backstop shows his displeasure by punching him in the face. The incident ignites a bench-clearing brawl between the Windy City rivals that leads to a 15-minute delay and four ejections during the White Sox’ 7-0 victory at U.S. Cellular Field.

Sources:
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