I've got a buddy who was a CA at XJT who was asleep and mistakenly answered the phone once. It was Scheduling and they said, "CA Smith?" He replied with a "yes." "This is Crew Sheduling and we are Junior Manning for a flight at xx:xx." He quickly escaped by saying, "Oh. You must be looking for son. He's one of your captains but he's not here. I'm a CA with USAir." Which was true, his dad was a USA CA.