A San Diego man may be the latest victim of “knockout,” a disturbing new activity spreading across the country involving teens or young adults physically assaulting unsuspecting strangers. Victoria Hyatt says her husband was attacked in such a way by a stranger in downtown San Diego on Tuesday. As her husband waited to cross the intersection at 2nd Avenue and Ash Street, Hyatt says a man walked up beside her husband and then, out of nowhere, punched her husband in the face.