I think the song is written about your subconscious mind. So ur subconscious is always with u and always thinking but you dont realise. Like when it sez: Every jumbled pile of person has a thinking part that wonders what the part that isn't thinking isn't thinking of. The part that isnt thinking is meaning ur subconsious.
That evil, filthy scarecrow. I almost got the bastard yesterday. I swear it's slowing down, maybe 1,726,892nd time lucky.
Humm, I don't see the connection to Sartre, could you elaborate on that at all? Like Kach, I thought this was about the subconscious (TMBG has a few songs with references to psychology, 'a self called nowhere' for example), specifically I got the impression that it's about how oblivious people can be to them selves, and the tendency people have toward hypocrisy (the scare crow sounds like the manifestation of a mirroring literary device similar to Shakespeare's fools who are able to mock the contradictions of the other characters with impunity). The division of the mind into parts which wonder about each other represents (for me) the often unfair or incorrect assumptions and prejudices that our minds make to simplify the world. The bit about the 'skull face' might be a statement about how frightening and disillusioning it might be to discover what really goes on in your own head, a representation of the evil that lurks with in. I know it's probably a long shot but I think the negative descriptions about the scarecrow (which I see as a mirror of your self) might allude to the fact that what you hate about your self you see in others, and the image of a scarecrow clumsily mimicking someones movements might exaggerate the negative qualities of the person being parroted like a caricature. If the scarecrow is thought of as a part of the mind of the person he follows, the fact that he can't be seen could be saying something about how the mind hides our own faults from ourselves, even though the 'scarecrow' (and presumably the persons hypocrisy) is plain to everyone but the person being sung about. Could also have reference to the embarrassing things that people sometimes do with out realizing it.