With record numbers of people traveling this summer, you're bound to run into some rude behavior from fellow airplane passengers.  Here are some of the worst things to do on a flight, according to a new survey from YouGov.com. Letting children play in the aisle Getting drunk Watching a movie or listening to music without headphones Using both armrests Eating strong-smelling food Trying to exit before people in the rows in front of you What airplane habits annoy you the most?  Are there any you're guilty of doing?