Few call it mood swings. Hell, I never experienced such(probably don't admit to it, as well). I'm not a transparent person, so when I get take the ride during these moments, only a few would just notice. However, I got an excuse, they just regard it as an artist's moodiness, which I dislike.
But being in that state feels a little rewarding. Deep thoughts play in my mind, thus giving me more time to ponder about life. I get to be a better listener and observant with the environment.
I do agree–the less you talk the less mistakes. But the more mistakes we create, the more we learn in life. Quite ironic, isn't it?