Talking with my Hands

I am an expressive talker.  Okay fine, I'm over-dramatic.  But I talk with my hands A LOT.  And I just have realized recently that when I'm on the phone at work, I still talk with my hands...even though the person on the other end can't see me talking with my hands.  So what's the point of doing it?  I have no idea, but I still do it.  Weird.