About 30 years ago I found an unopened bottle of Dom Perignon champagne, dated 1929, in a huge pile of trash removed from a house that was being vacated. I kept that thing like it was some kind of treasure until, a couple years later, my family was moving, so we opened it. No surprise, it had gone bad; in fact it tasted a lot like sherry, but not very good sherry. We poured it out. I would have been better off to leave the bottle unopened.
Hey! haven't you ever had Dom Perignon before? It tastes like bad sherry, and that's the good stuff!