I was a dumbass, and accidentally turned my mic off, leaving nearly two full songs without vocals. The night after we recorded, Brian did a poetry reading at a local bookstore, which I recorded---and then synced up a portion to the blank vocal track at the beginning of the song; I think it worked really well!
There's also an incidence here of me playing a single chord of "stealth" guitar, at the point when the guitar comes back in after the dramatic pause. Don't tell anyone!