I'm noticing that half the time when I'm chatting on-line with someone, I will say what I'm about to type out loud just before I type it. I'm not sure why this is, but it makes me feel like all the people on TV and in the movies who have to read what they're typing out loud, apparently because the audience is too dim to just read what's being typed. (Okay, so just putting words up and making the audience read it is boring and frequently poor movie making as well. But that is really beside the point.)
Oddly, I only do it when I'm chatting with someone. I don't do it when typing up e-mail or anything like that. Very strange.