Lyric discussion by JokermanDance 

"On the day that I forget you, I hope my heart explodes"

That, and the similar sentiment from the end of the first verse, are (I would argue) appropriated from/references to Psalm 137: "If I forget you, O Jerusalem, let my right hand forget her cunning. Let my tongue cling to the roof of my mouth if I do not remember you."

Name me one songwriter who can use the bible like John Darnielle. God damn, that's a good line.

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