Once, I inadvertently muttered "whiskey tango foxtrot" sotto voce at FLL during a gate grope lineup (completely unrelated to security, was reading an email on the iPhone). I was told by the 3-stripe TSO leading the gate grope that if I said "one more f-ing word," he would have me arrested for "disturbing the peace and obstruction of a federal officer." Since I was traveling with my boss, I did not press the issue.