Wonder what the stars did during the writers strike? ET is behind the scenes of some of your favorite CBS TV shows to give you the scoop. We're on the set of "Two and a Half Men" with CHARLIE SHEEN and JON CRYER; "CSI: Crime Scene Investigation" with MARG HELGENBERGER and GEORGE EADS;  "Criminal Minds" with THOMAS GIBSON and JOE MANTEGNA and more to get the 411 on their hiatus happenings.