To have imaginary conversations with people who aren't there?
If I'm angry at someone I will talk to myself as if I were talking to them, like cussing them out and yelling at them. I am very quiet and have trouble expressing myself, and I guess I have a lot of anger issues.
Anyway, instead of saying things to their face, I will just say it into thin air when I am alone. Sometimes people have heard me and thought I was psycho lol.