When you teach children about expected vs. unexpected behavior, it helps them to differentiate between behaviors that appropriate or inappropriate. This is particularly important for children who are not as socially aware as their peers. Those who need more explicit teaching, learn what behaviors they should or should not be engaging in.
This activity was will help children learn to differentiate things they should do with their hands (give a high-five, color a picture, etc.) vs. things they should not do with their hands (hit others, pick their nose, etc.)