I think most of us have had them. Anyone who hasn't is probably an android lacking emotion subroutines and pumped full of heroin.
We're talking about Bad Days. And I'll be the first to admit that, as far as days go, it wasn't that bad -- on the surface, anyway. Actually, I think I react better to those kinds of bad days than I do to the existential bad days, where an epiphany sneaks up behind you and wraps a garrote made from rusty piano wire around your neck and chokes you until you're forced to admit:
"I hate my job."