In my classroom, I want my students on "tell on" each other for doing something awesome. Examples may include, picking up a mess that is not theirs, helping out a friend, paying attention, staying on task, etc. When another student notices that they can write a "shout out" for their friend. We LOVE reading shout outs at the end of the day. Normally I give the person that got the shout out AND the person that wrote the shout out a little piece of candy (gum, mint, etc).