Fentiman's Curiosity Cola
Curiosity Cola from Newcastle Upon Tyne had a fitting name, not only due to its tiny bottle (that Orangina can is there just for scale), but also because of its description as a "fermented botanical cola drink with ginger and herbal extracts"...and the presence of a very small amount of alcohol that resulted from the brewing process.
The ginger and herbs were pretty strong, which I suppose is a good thing, but isn't really anything so compelling that I'd reach for another one, as I was hoping for something nuttier. And no, the alcohol was not detectable. Curiosity, indeed.