 Complete the following phrase:  In 1999, Zimmer was hit by a sharply struck foul ball batted by Yankee second baseman Chuck Knoblauch. The next game, Zimmer wore an army helmet with the word ZIM painted on the side and the Yankees logo stenciled on the front, which was given to him by Michael Patti, a Madison Avenue advertising executive. This led to the installation of railed fencing in front of the dugouts at Yankee Stadium, which eventually became commonplace at all ballparks. Zimmer was involved in a brawl with Pedro Martínez in the 