I was extolling the virtues of a 12 year old Macallan to a friend of mine after dinner in a restaurant (and he was agreeing with me) when the waitress came over and said these exact words, which are burned into my memory forever:
"Oh, by the way, it turned out that we didn't have any Macallan's so I gave you Bells. I hope that's ok?"
Probably the most humiliating experience of my life. My wife laughed herself sick.