I found a great site that teaches about bullying.  It is http://www.pacerkidsagainstbullying.org/ Check it out!

Being positive and playing it cool is the best strategy for helping a student with difficult behavior. Sometimes, when I'm working with a student who is oppositional, I point out a positive before I address the more serious issue.  For example the student may want to play a game instead of coming to his science lesson.  So, I become interested in his game and tell him what a fun game that is and perhaps we can play it with the class during recess.  I put him in charge of setting up the game and he now has something to look foward to later in the day.  I didn't demand that he come to science or that it wasn't time to play a game.  This would have threatened the student and made him dig his heels in.  So, what if he still doesn't come? Then I would give him a directive and walk away to give him time to make the right decision. If he still doesn't come then I rely on natural consequences, such as making up his work before a prefered activity.  I believe it is important for the student/child to feel in control of his/her perdicament.