The last word

I've come to the realization that I always want to have the last word. Even when I know I should just stop, I keep going until the last word is mine. Why do I do this? I don't know, it's like some nervous tick, like I don't feel at ease until I've said my peace and I make sure I'm the last one to say it. Ok, really I don't know, but I noticed it after a few conversations I had today and needed a place to record that little thought. Anyone else have to have the last word?