I used to do pushups to Mozart's 40th symphony...before I even knew anything about classical music. The first movement was just energetic and made me want to keep going. My classical music folder was a few single movement pieces of various composers...
and the first time I was actually moved by a piece of classical music...I was quite stoned

(shsshhh)
It was Beethoven's moonlight sonata...and the third movement, I just couldn't follow how 1 person could be playing it. I felt the noted pounding on my brain and it felt all tingly.
And the first opera I ever heard was Mozart's Figaro, I would listen on my way to class. And of course like in any crowded school it takes 20 minutes to find a parking spot, so I would listen to it really loud with the windows down and I'd be singing along.
Ohh also, I would listen to Vivaldi really loud in my car, one of the first pieces I heard were the 4 seasons..and everytime before the 3rd movement of summer it would get quiet...and then BOOOM! It would scare me to death and almost caused me to crash 2-3 times hehe. Ok not crash but move the steering wheel a little.
And I used to listen to a paganini violin concerto over and over, that was pretty stupid.
Haha ok last one, I was listening to Brahms 1st symphony during a math test...and I just started humming along while everyone was hysterically cracking up. And then I couldn't get the tune out of my head...lets see 5^4= dararara