a colleague came back from the coffee place with an expression on his face akin to the proverbial bulldog that swallowed a wasp. In the interests of science (his words) he'd sampled the late with menthol. Result of experiment coincided exactly with what you'd expect.
Some years back, in Spain, I bought a carton of chocolate milk - a pleasant refreshing product as a rule. First swig then spat out a revolting mixture of what seemed to be a milk with coca cola. To this day I'm uncertain if that's what it was meant to be - I've heard of similar, or whether it was merely "off"