Oh what a day

listening to: something by the Foo Fighters... something about "another round..." or something...
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Hypothetically speaking... what do you do when one of the days that is supposed to be the absolute best turns out to be one of the absolute worst?

Is it because you get your hopes up too high for that day? You expect everything to be perfect and then because you hoped for so much everything goes totally haywire.

I just don't get it. Makes no sense what so ever.