It is tradition at Douglas MacArthur that the entire school gathers in the gymnasium for The All School Sing.  One by one, each grade stands up and sings a song to the rest of the school.  At the end of the program, the entire school sings together.  This year, when the students thought they were getting ready to head back to their classes, the teachers surprised them by doing a Flash Mob dance to “All I Want for Christmas is You.”