I have always done that & it drives me crazy! It seems like everyone else in the world thinks before they talk, but I just blurt out whatever comes to mind. I keep telling myself that I won't do it anymore, but I can't seem to control it. It gets me into trouble, & it makes me sound like an idiot. I thought it was entirely due to my social phobia, which I'm sure doesn't help, but I just read in The Borderline Personality Disorder blog that we often do that. Wow, I never knew that was a symptom! I've known other borderlines who don't have that problem ( or at least, don't appear to). Do you?