I still remember the first time I bought a record (yes, this is PRE-CD era) of Puccini's
Turandot. I had only heard
Nessun Dorma and
Non Piangere Lu, the two "hit" tenor arias, so I didn't really know anything about the rest of the opera.
I put the record on, and it starts with this bizarre whole-tone fanfare.. and then all of a sudden, these polychords of C# over D minor.
I literally stopped the record to read the label. I was SURE it was the wrong record they had put in the sleeve.
I think I was 17 or 18 at the time, and needless to say, that marked me for life!

I loves me my polychords now. And
Turandot remains one of my two favourite operas.