We all know teenagers can use help learning how to socialize with each other and recognizing when they use stereotyping and discrimination.
This lesson is primarily written for the Psychology 101 classroom studying Social Psychology. That said, you could knock off the last few slides and this is a nice interactive lesson about social dynamics.
This lesson forces students to discriminate against each other then come together in groups that show out-group bias, then reform into groups yet again. You can make this lesson incredibly fun if you really play up your part. My students had a great time and got incredibly competitive, yet learned a great deal in the end.
Psychology teachers, this powerpoint is also an introduction to the Robbers Cave Study, In-Groups and Out-Groups, and Jigsaw Learning.