Long-haul flights are known for being incredibly uncomfortable. While you're usually jetting off to a luxury occasion, the cramped seating tends to dampen spirits a little.
In addition, an annoying passenger sitting in close proximity can make the lengthy commute incredibly miserable.
Taking annoying passengers to a new extreme, one woman, who suffers from allergies, was shocked by the audacity of one passenger who selfishly coated herself with perfume.