So, true, @quotes-haven.
And you could also be mad that, even though you've personally done nothing to earn or deserve it, that there's only half a glass, the glass is small, and what's in the glass is not remotely what you want, and then go destroy the glass along with its contents.
As much as I believe there are many of us with the first attitude, I also know there are too many (one is more than enough) with the second.
Some of them seem to be running around here right now. :)
It goes on and on .... Or rather, it can go on and on. :-)