Your plane ticket is your pass to far-flung destinations—on several conditions. Check your airline's contract of carriage; there, buried in pages of text, you'll find a list of violations that'll get you banned from boarding or even kicked off a plane. Contracts of carriage vary slightly by airline, but most contracts have some kind of language prohibiting passengers from doing anything that endangers the safety or comfort of fellow flyers. This is all subject to interpretation by airline employees, which is why we often see so many wild stories of passengers getting the boot. So what, specifically, shouldn't you do? The following seven behaviors should be avoided at all costs.