Which piece made you fall in love with opera?

Basically, what the title says: What aria, duet, overture, interlude, choral piece, etc., made you realize how phenomenal opera is?

For me, it has to be the Ora noi duet from Madama Butterfly. I was always a casual fan of opera, mainly due to my mother's love for classical music in general. But two years ago, I saw Madama Butterfly, and it all just… clicked.

Cio-Cio San's bittersweet delusions, Sharpless' difficult position, and the gradual rise of tension in the melody that climaxes in the Che tua madre aria a bit later—it was breathtaking. That was when I truly understood what opera is all about: the perfect coming together of plot, character "action," music, and emotion.

I guess I just want to appreciate more moments like these. Feel free to rant!