I know, I took a lot of grief recently for admitting to drinking Rum & Cokes and Cuba Libres. So sue me, it's always been one of my favorites. As a kid, I used to add imitation rum flavoring to my cokes. It's a classic.
Recently I tried and discovered I liked the new Coke Blak -- it's not as sweet as regular coke, and I like the subtle coffee flavor to it. And yes, I tried it with rum, finding that dark rum worked the best.
But recently I tried it with another alcohol, and discovered I liked it even better. I've even come up with a name, but I still haven't decided on a garnish:
1 1/2 oz. Irish Whiskey
8 oz. Coke Black
3-5 ice cubes
Place ice in an Old Fashioned glass. Add Irish Whiskey and Coke Black, garnish with _____(?).