It is an old saying, but still has some truth to it. Some people charged with a crime make a deal to reduce, or sometimes almost eliminate any punishment, in exchange for telling the police and prosecution useful information about other people involved in their crime with them. Besides the advantage of reduced punishment, this type of deal carries some risk. Depending on who one is cooperating against, and what your long term plans are, there may be a risk of getting some stitches. If you have a chance to cooperate in exchange for a reduction in punishment, it may be a good deal, but give it some serious thought, you do not want to be getting any stitches, or worse.