Karma. We all know what it is, and pretty much how it works-
Essentially, you can boil it down to "if you do Good things, Good things will come to you, but if you do Bad things, Bad things will come to you". Seems simple enough, right?

But just keep in mind, Karma can be a real Bitch.
Sometimes you can Love it.
Other times you can Hate it.
But at least, through the thick and thin of things, you can Always Rely on it.