Conversations in my Head

Sometimes I spend so much time working through things in my own head that I play out a full conversation or argument in my head before we even talk. Imagine your surprise that by the time I see you, I am fired up, pissed off and sure that I know what your feelings and response is about this. And you stand there... "What?" Because of course you have not been privy to this conversation I've had with myself. You have no idea why I am so wound up. And so it goes, "Simmer down fireball"