When his Los Angeles Trader Joe's store became the site of a three-hour standoff with police Saturday, an employee named Sean Gerace sprang into action. After hearing gunshots and screams, Gerace took several of his coworkers to the store's upper level. "I grabbed an emergency ladder, barricaded the hallway, grabbed a weapon, put the ladder out the window, and just tried to get the attention of a SWAT officer," he told a local TV station.