OK, guys... We all know that whiskey is a broad term for describing different variations of the spirit. Several regions and countries that make whiskey have their own distilling rules and regulations for the hooch to be considered official.
In the simplest of terms, whiskey is comprised of water, a grain and yeast (if you add hops to those three, you get beer), and is aged in oak casks. The way you manipulate these ingredients accounts for all of the different varieties.
So instead of being like Mikey in "Swingers" (above) and snagging "Any Glen...", check out this nifty cheat sheet that describes the subtle differences between this glorious giggle water.