I'm a talker. Always have been. Matt says there are no strangers for me, only new friends, which is a very nice way of saying I'm a chatterbox. :) But I do have the ability to recognize signals when people are done chatting, and I can also end a random conversation easily, unlike some members of my family *cough*.
Where I notice my lack of communication is on the bus to and from work. Everyone has their iPods plugged in, mp3 players, reading the paper or a book. A packed bus full of people at rush hour is compeltely silent. It's weird. And I'm one of them. I don't want to talk to anyone at the end of the day. I'm tired, my brain is full, and I really just want to eat. (It didn't help that on my first bus ride home I got 2 requests for my phone number from strange men.)
So, for about 80 minutes on M/T/W, I don't talk to anyone. I happily plug my earphones in, and listen to podcasts like Savage Love, This American Life, and Fresh Air. Sure, you can ask me what time it is, where this bus goes, and that you like my shoes. But please don't ask me for my phone number or email address. And avoid the seat next to me if you smell. I have a sensitive gag reflex and just might throw up on you (hasn't happened yet but I came close last week).