Trigger, not anywhere near as critical as your work, but years ago when they had teletype machines an sporadic "u" would pop up in the news sent out world wide by the news agency. They called in repair men, but couldn't find anything wrong with the teletype. As I said it was sporadic. After several trips they had the repair man sit down in the office to basically watch the teletype machine and the news reports to see when the "u" showed up. Found out the teletype operator was large-busted and when she would occasionally reach over the machine to get whatever, she would accidentally hit the "u" key. Not exactly World War III material, but annoying in news releases.