Earlier this month, a photo emerged on social media of a passenger on a plane who had flipped her hair over the back of her seat, thus obscuring the screen of the person sitting behind her.

Outrageous.

But there are far more egregious in-flight crimes that go unpunished on a daily basis. Such as the following:

1. Sock removal

Many traditionalists will argue that shoe removal alone is bad enough to warrant major sanctions. But so commonplace is the practice that we'll focus our attention on the greater of two evils - those passengers who consider it reasonable to discard not just their shoes but also their socks, unleashing a pair of malodorous and unkempt hooves upon all those in the vicinity.