Rudest Things On An Airplane, Ranked By Frequent Fliers

What's acceptable on a plane? Vote up behaviors you consider rude, annoying, or offensive, and vote down those that are fine. This will help us become more considerate of our fellow fliers. On an airplane, normal social etiquette often goes out the window. The excitement of a trip, cramped space, and tired passengers can contribute to this. But part of the issue is the lack of clear rules or social norms for airplane behavior. If reclining your seat or calling the flight attendant is rude, why are there buttons for these actions? Do middle seat passengers have more rights to armrests than those in aisle or window seats? Is it anyone's business if you order multiple cocktails, watch a NSFW movie, or eat a tuna salad sandwich?