Just saw this brief review of Coke Blak at slashfood.
The roadside services throughout europe (well, France, Switzerland and Italy, atleast) had this stuff in little cans all over the place.
From memory - someone did try it, much to their regret. To be honest - regular coke is bad enough, why mix it with anything else? Lemon, Lime, Vanilla, Cherry… even Clear coke, afaik
While I’m at it… I think someone deserves a round of applause for making a Stargate out of cupcakes. (The finishing touch would have been a pile of blue jelly [Jello, for americans] for the ka-woosh)
