...which would it be?
(I read the premise in a novel and now I am curious)
For me it would be difficult to choose, but if I had to choose one right now it would be the first time that I was listening to my best friend sing in public, to a full room, and out of the blue, he dedicated me the song "Amigo" (a Spanish song about two best friends). My heart swelled and I sobbed and sobbed for the duration of the song.
My friend died in a car accident less than a year later :(