Fill an old-fashioned glass with ice.
Pour the coffee liqueur straight down into the base.
Layer the vodka on top by pouring slowly over the back of a bar spoon.
Top with soda water poured the same way, keeping the three bands distinct.
Serve with a straw pushed to the bottom and drink it in one continuous pull.
An American bar-trick drink from the 1980s. The straw is not decoration: sip it normally and the layers collapse into a weak Black Russian instead of delivering the intended sequence.
My Bar Shelf läser ditt skåp och visar varje cocktail du kan göra av det du redan har - inklusive Mind Eraser.