While Amanda Palmer has said that "Half-Jack" was about far more than one subject, it could also be about a split personality in her (who just happened to be an authoritative male figure) who was forcing her to suicide.
"It might destroy me But I'd sacrifice my body If it means I'll get the Jack part out AH-OH! AH-OH!"
"Mrs. O" is pure terror about Holocaust denial from a teacher. Coupled with the bright chords that Amanda uses, it creates a nightmarish effect rivaling Coin-Operated Boy.
"Missed Me" could be about either child molestation or an Enfante Terrible manipulating an adult. Either way, it's terrifying.
Her cover of Nirvana's song "Polly" somehow managed to make a genuinely creepy song even more horrifying.