Lyric discussion by lucaswysocki 

"Spencer discussed that lyric in an interview recently. Apparently, he was with a girl who was complaining about the screeching sound buses make, and he told her to pretend they're just big singing whales floating around the city. She told him it was stupid, and I guess he was pretty embarassed about it or something, because he didn't want to elaborate on it to the interviewer. "

haha, this confirms what i was going to write. The song is about an eccentric guy with a girl always telling him his thoughts and ideas are dumb. So the grounds for divorce are his strange thoughts and eccentricities. This is obviously your typical unartistic, girly-girl who can't appreciate a good random thought. Good riddance. Maybe he dumped her anyway :)

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