"If your so-called friends urge you to do anything you know to be wrong, you be the one to make a stand for right, even if you stand alone. Have the moral courage to be a light for others to follow"
                       ~Thomas S.Monson

If anybody tells you especially your friends to do something you know is wrong you shouldn't do it. You should be the one to advise them and tell them that its wrong doing. Be the one to make them reconsider their choice to either do it or to choose the right and not do it. Even if you stand alone and your the only one who agrees that its wrong doing you should still speak up. If they start laughing at you and start calling you names then just walk away. Sooner or later they will severe the consequences of their wrong actions and tell you that you were right. On the other hand if decide to not follow the rules and decide to follow the crowd because no one else spoke up you might be the one  to get in the most trouble because your so-called friends didn't have your back. That way you learn your lesson the hard way. So I advise you to always be that one person to stand up and choose the right. Even if they laugh at you, you will soon feel good with in for not doing the wrong.