I unfortunately have to travel a lot of weekends and occasionally holidays. Since most ffs don't usually fly those days on paid tickets, I have on many occasions sat up front in f alone or almost empty while coach was full! I have swapped seats with my wife's coach ticket before and we were even accidently upgraded on a free fare, which I don't think of as stealing. I wouldn't mind talking to someone else up front other than the typical ff. I'm sure all of you have enjoyed talking to the wide-eyed, "gee, leather seats!" individuals brought up front. I would only consider it stealing if someone moved up front on their own accord, without someone associated with the airline giving them permission. This would then exclude the mad rush of pax from coach to business on a three section flight when the F/A encouraged pax in coach to move up over the intercom. This happened on more than one AA MIA to SJU flight I had years ago. Although the only pax I've seen removed from f were there "accidently", I have seen pax removed forcibly from coach! A man and wife refused to sit in their newly assigned seats due to equipment change at DFW and in turn told the individuals holding the assigned seats to "Go to Hell", the F/A to "Go to Hell" and the Captain to "Go to Hell". After the Captain announced a delay, we applauded as the Federal Marshall escorted the couple off the plane. All three instances I've seen individuals forcibly removed from flights were coach passengers and everytime, it was at on AA at DFW.