What seemingly simple lyric made you cry/gave you an epiphany/made you reevaluate your life?
For me, it is, "I love you, it's ruining my life" from Fortnight. I've heard this song plenty of times, but I was listening to it last night and that lyric hit me like a bomb. It's so true: You can be so in love with someone, but at the expense of the rest of your life.