If you want to read the complex history of St. Valentine's day and why it's a thing, voilà.
Also, apparently the tradition of giving chocolate started because it was thought to be an aphrodisiac (like oysters), though it really isn't. Chocolate shops put them in very pretty boxes and bam! Awesome Valentine's gift.
And, for those who want to give roses but don't understand the meaning, a chart:

If you want to do something besides roses, here's a flower dictionary to help you out.
Now of course, not all of us have a special
Ah, wait, I must woo the mods so that this will be posted.

And let's turn on a little music...
Happy Valentine's Day everybody! I work today, so I'm sure you'll all have a better time than me.