Among the worst things you do on a plane – that doesn’t include touching another passenger – are draping your hair over someone else’s seat back, covering their entertainment screen, and sticking your bare feet in the air or on someone else’s tray table.
But maybe the absolute worst is bare feet, clipping toenails at your seat during the flight. And instead of collecting the clippings, you just flick them off, and one lands on your seat opponent?