October 10, 1991 -- Former U.S. postal worker Joseph Harris shoots two former co-workers to death at the post office in Ridgewood, New Jersey
. The night before, Harris had killed his former supervisor, Carol Ott, with a three-foot samurai
sword, and shot her fiance, Cornelius Kasten, in their home. After a four-hour standoff with police at the post office, Harris was arrested. His violent outburst was one of several high-profile attacks by postal workers that resulted in the addition of the phrase "going postal" to the American lexicon.