I once went to a corner liquor store in SF for some cheap non-vintage Brut. I reached way in the back behind all the other bottles because I wanted one with an intact capsule, and out came a bottle of '85 Pol Roger cuvee Sir Winston Churchill.
It had no price tag, and the indian dude had no idea what it was. He asked me if I'd pay the princely sum of $20 because it was a vintage bottle. No problem!
Closest to stealing champagne I've ever come
