No filter

Do you ever just blurb out a thought only to regret it immediately right after? Recently, I've found that my thought filters are not working well. On several occasions, I catch myself right after saying it. It feels rather foolish when it is in front of your boss. Once I get comfortable with a person, I feel like I can say whatever comes to mind, but this shouldn't apply to my boss. In any case, now she knows the 'dark side' of me and there is nothing I can do about it.