A month or two ago I bought a bottle of Booker's Bourbon. After having a glass or two (which were delicious, of course), I placed the bottle on a shelf. Since the bottle was a bit too tall to fit, I put it on its side. A few days later I went back to have some more, but it had developed a very bitter flavor. And after every sip, I'd feel a sharp pain in the middle of my tongue as if somebody pricked it with a needle! Needless to say, it was completely undrinkable. I kept the bottle anyways and found a place to store it upright. But even to this day, it still has that bizarre taste and makes my tongue hurt.

Since it originally tasted fine, I wonder if storing it sideways allowed it to absorb some undesirable flavors from the cork in the stopper. Has anybody ever had an experience like this before?