I heard a story about a working airline pilot going through security soon after the TSA took over. The agent was going through his flight bag, taking the books out, etc. The pilot asked what he was looking for and, without missing a beat, the guy said “anything you might be able to use to take control of the aircraft…” The TSA guy wasn’t too happy when the pilot replied that he was supposed to have control of the aircraft.
In all seriousness, I’ve only had them question my flight bag once. I don’t think they liked the 2D cell mag lite I carry. My reply was that I’m required to carry it.