The ordeal of air travel opens the doorway for some insane behaviors. You have groups of complete strangers who are collectively sleep-deprived, stressed, and overstimulated, crammed into far-too-small spaces for far too long. Air travelers usually have a lot riding on the success of their trip, too, and literally can't afford for things to go sideways, with holidaygoers having spent their literal life savings and cashed in all of their PTO in order to make this trip work—usually also facing un…