Virginia - what you describe is indeed the perfect passenger!! On a 757 where there are 233 passengers, I would say there are about 230 of these types of passengers. There are on average the odd 3 people, who make our day to day working lives very difficult and sometimes unbearable. I'm glad to say though that at my airline it is a small minority, and we should be remembering the 230 people at the end of the day and not the 3. but as somebody did mention, we do tend to remember the things that made our day worse, rather than the people who didn't have an impact whatsoever.