Just once a few years ago. I don't recall much about it other than them yelling at him to stay seated but he was up and in the lavatory in a heartbeat. They yelled at him to hold on and to stay there until we landed and had come to a stop. Once we landed and were at the gate they kind of corralled the guy in one of the galleys and were fussy at him but I didn't stick around to see if any authorities showed up.