This is something that happened to me yesterday - I went to a show of a psycho-billy band. Not my usual style at all, but I had listened to this band at work called The Creepshow and I just fell in love with it on the stop. So when they came to that small bar in town, I went for sure!
So I was really nervous about being in the middle of metal fans and punk and headbangers, etc and sticking out like a sorethumb. Well, turns out this late-30's IT guy with the checkered shirt and the glasses that plays Axis and Allies every week at my local gaming store was there too.
Lesson learned: you never know what people like, and everybody as a surprising interest out of their usual genre.
So my question is - is there any time in your life when someone appreciation for something really took you off-guard? Maybe it's the time you found out your long-haired, metal-shirt wearing colleague liked watching Grey's Anatomy. Or your straight-laced, 72 years old grumpy, conservative father-in-law liked listening to Slipknot really loud when cleaning.