I had been so looking forward to my bottle of Cantillon Fou' Foune. The apricot lambic is something of a rarity and I'd been saving it up for a few months. The first sign that something was not as it should be was when I took the cap off to find a small amount of beer between it and the cork.
On being drawn out, the cork told me my bottle was filled in 2005, longer ago than I'd realised. Still, it's a lambic, right? It's robust enough to survive things like this intact, isn't it?
Actually, I still don't know the answer to that. The beer was powerfully sour, to the point of throat-burning. It's not vinegar, though; it's the proper bricky saltpetre sourness of good lambic, just turned up to an extreme level. By squinting a bit and concentrating, I could just about detect the ghost apricots lingering at the back of the flavour, but they were very insubstantial and quite possibly imaginary.
So, unless you're prepared for sourness beyond normal human endurance, my advice is to drink your Fou' Foune young.