Have you ever tried a drink called Snake Bite Black? It is half cider/half beer, then they add blackcurrant. It taste really nice but the effect of the venom is insidious and soon you will be either delirious or comatose without realizing it!
Pour 1/2 pint Lager, and 1/2 pint Cider into a Pilsner glass, then add Black Currant until drink is purple in color.