when your brain is all clogged up with what youre going to do this afternoon , and what you have to pick up at the store , and maybe you have a headache a little bit , and youre kind of tired and wondering if you can go to bed early tonight , and youre thinking about how that guy cut you off when you were patiently waiting for a parking spot , and how youre pissed off that you had to pay taxes instead of getting a refund last year and that better not happen this year , you can see how it kind of clogs you up .