When things get out of hand in the classroom, I take a break and have students write all the good things about each other student in the class. Then write the name of each student at the top of a piece of paper and copy on to that paper what everyone said about that student. Give the student the paper with the comments about her/him. Before long, the entire class will be smiling and saying, 'Really?' and 'I never knew that meant anything to anyone.' and 'I never knew others likes me so much.' You'll find students treasure this paper and keep it with them forever.