Shield your eyes children, this is a grown up drink.
Turned onto the Dark N' Stormy by an esteemed friend I have YET to have a drink with (a travesty) I must say this drink carries quite a bit of heft for a fizzy cocktail. My first attempts were with dark rum and diet ginger beer. This resulted in a Light n' Windy more than a Dark N' Stormy. So we got some real sugar Ginger Beer and some Black Strap Rum. I like to toss in a splash of the dark rum as well because, really, you can't have too much rum. Add a garnish of a shiny lime (shiny from lime oil because its nice and fresh, not because its been coated with wax, preferably) and you have yourself a good category 2 maelstrom brewing off the edge of your lips.