A group of FBI agents swarmed the Black Angus restaurant in Valencia this week, except instead of serving warrants they were serving drinks. Five local agents participated in Thursday’s Tip-A-Cop night, a fund-raiser hosted by the Special Olympics. For the Fundraiser, the agents shadowed Black Angus wait staff, serving drinks, appetizers and making small talk with diners. “It’s not every day (people) get to be waited on by and FBI agent.