Lyric discussion by pooperscooper 

On the part where it sounds like he is going to say another line but but doesn't, it used to be "I don't have the patience to watch you battle every miniscule disease" but Jack thought it was too harsh, so he took it out.

He also said that the song is about how with girls, there is such a big fuss over everything and how they are so particular about things. Like a woman would say something like "Oh I won't take Tylenol, it doesn't work for me," but a guy would just take and swallow whatever's handed to him.

(This is all from whitestripes.net just so you don't think i'm just pulling this out my ass.)

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