Zombies - obviously they're doing it in a much more expansive way on The Walking Dead - basically, what you used to do is you put a bunch of goo on an actor and have them shamble towards you, and it's a very effective creature. It always has tremendous impact, just that feeling of death coming for you; that's universally accepted.
The essay I had to read was called, "An Essay on Criticism" by Alexander Pope. The first challenge was that the essay was, in fact, a very long poem in "heroic couplets". If something is called an essay, it should be an essay.