When I was teaching, my students LOVED this free reward. When we were going to lunch, I was always looking for "A YES Line" our class term for a terrific line in the hallway. When we got to lunch, the SILENT, UNSPOKEN QUESTION was, "Were we good?" If the answer was YES, they were allowed to move out of our normal ABC line order and then sit with a friend at lunch.
You can download this poster here at my blog!