Speaking Using the Usted Form

Students who are learning Spanish need to learn the difference between the formal form and informal form.  This can be difficult because the only time it is used within the class is when speaking to the teacher.  I make several other students "ustedes" by giving them a paper crown.  These students are then addressed in the formal form throughout the class period.  It seems to me, the boys love to wear the pink and purple crowns the most!