Make a self-control roll whenever you experience a clear social slight or “snub.” On a failure, you lash out at the offending party just as if you had Bad Temper.
Make a self-control roll whenever you must keep silent about an uncomfortable truth (lying by omission). Roll at -5 if you actually have to tell a falsehood! If you fail, you blurt out the truth, or stumble so much that your lie is obvious.