I'm in a Death Cab for Cutie kind of mood. So here's a good video of a live version of "We Looked Like Giants" with Gibbard explaining his motivation for writing the lyrics about halfway through the song.
"God bless the daylight, the sugary smell of springtime,
remembering when you were mine
in a still suburban town.
When every Thursday I'd brave those mountain passes,
and you'd skip your early classes,
and we'd learn how our bodies worked.
God damn the black night with all its foul temptation.
I became what I always hated
when I was with you then."