Trolls. Everyone has raged at them before, but few actually have seen one. [Probably because they never leave their caves.] The truth is, trolls can take on two forms. Both are equally trolly, but they leave a different impression.
Here is the "Troll Face" that most people are familiar with:
The troll face is a poser. Like any good hipster, Mr. Green was a troll before trolling was cool.