To that end, I'd like to address those of you who use the word "literally" as a synonym for "figuratively"--the direct opposite of how it should be used. You people are driving me insane. Worse, you're making yourselves look like idiots. Here are a few examples of the dumb shit you are prone to saying:
I was so angry my blood was literally boiling!
I such a bad hangover my head was literally exploding.
Her house is so filthy! It's literally a pig sty.
The truth is:
a) Blood doesn't literally boil. Well, okay, it can, and maybe in the back woods of Missouri it sometimes does. But generally that takes place only when the blood is in a cast iron pot on the stove of a serial killer. If your blood were to boil while it was still inside your body, it would cook your internal organs and stink up the room mightily. On the bright side, you wouldn't be angry anymore. On the not-so-bright side, you'd be dead.

b) While hangovers can be a real bitch, they don't literally cause one's head to explode. Causes of literal head explosion include, but are by no means limited to:
-dynamite packed into the ears
-a grenade crammed down the throat
-two shotguns, one discharged into each eye socket.
It's pure folly to claim that your head literally exploded from yesterday's hangover, since you're still alive now to stand before me, animatedly yammering on about it like you survived the holocaust. At such times, I only wish your head had exploded so I could be enjoying some peace and quiet right now.
c)

I don't mean to imply that I'm not a fan of ridiculously inflated hyperbole. I rarely utter a sentence that's not exaggerated to the point of almost total falsity. Why? Because real life is actually pretty boring, and the retelling of it is therefore usually mind numbing. But when liberally sprinkled with half-truths, exaggerations, and balls-out lies, it can become fascinating. So go ahead, exaggerate! Make shit up! Lie your ass off! Just don't take that extra, silly step of inserting the word "literally" right before a phrase that is, in fact, figurative.
Having trouble deciding when to use "literally" and when not to? I have a solution: Just don't use it. Ever. Say, "I was so angry my blood was boiling," instead of "I was so angry my blood was literally boiling." Nine times out of ten when a person uses the word "literally," they're using it wrong and crapping all over the English language. (Notice I didn't say "literally" crapping all over the English language." But that'd be funny to see, wouldn't it?) And there's a reasonable chance you might be one of those people who has no idea when it's okay to say it. So know your limitations and just steer clear of that word, okay?
This message has been brought to you as part of my ongoing effort to keep average citizens from doing things that bug the shit out of me. Thank you for your cooperation.