Trying to ferment a bottle of "Tropical Colada V8 Smoothie Splash" was a terrible, terrible idea. I mentioned it a few years ago here, and it's still among the worst outcomes I've had.
A weird 'wine' that actually came out well was fermenting one of these honey/plum tea jars that I found on clearance at a local Korean grocery store. I didn't particularly like the tea you got from mixing a spoonful of the stuff with hot water, but it made for a fruity mead-like drink that I'd definitely brew again if I got a deal on another jar.