Life imitated art recently on the New York subway. Gerald McCullouch, who plays ballistics expert Bobby Dawson on CBS’s CSI, drew on his real-life knowledge of boxing to take down a would-be mugger wielding a large kitchen knife. The actor had just arrived at JFK Airport from L.A. when the incident happened. In his own words….. “It was about 2 a.m.,” McCullouch said. “I have a place [in New York] now, so I take that train at least...