I had a very clear image in my mind... -- which wasn't this one... --
and then I knocked a mirror off the top of one of the filing cabinets next to my desk....
(Thankfully, I'm not that superstitious....)

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Anger is a better sign of the heart than of the head;
it is a breaking out of the disease of honesty.
(Lord Halifax: Moral Thoughts and Reflections)

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Anger has no eyes.
(Hindi proverb)