Life. A lot of people go around suppressing every negative emotion-- or trying to (and failing, and berating themselves for it), thinking they should.
So when you let one show, they really let you have it.
That's life. I think it's sick-- I wonder why we don't all agree to stop playing this game we all, once upon a time, agreed to start playing-- but it's real. We're not going to stop any time soon.
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"Alas, our dried voices when we whisper together are quiet and meaningless, as wind in dry grass, or rats' feet over broken glass in our dry cellar." --TS Eliot, "The Hollow Men"