The song is heavy, complex enough to be interesting, and simple enough to headbang. The bass is particularly awesome, with slap accents throughout. Not to mention Mike Patton's legendary vocals. The song seems to be about losing your mind as you grow older. It clearly has something to do with going mad, with Patton's screaming and laughing in the background between verses.
I really like this song for the punchy rhythm in bass(accompanied fantastically with the guitar, drums, and Bottum's carnival-like keyboard), and Patton's variance in vocal styles throughout.