Hmmm... Sempai (Sensei) says... already mentioned above.
Dragon and castle. The kids form a magical castle around a fierce dragon (by linking hands in a circle facing inwards). The castle can move, but if the walls break or the dragon touches them, he will escape. If the dragon escapes, the kids must fall to the ground and make the sound of ultimate despair (raspberry). Level 1 is normal, Level 2 has them shut their eyes while dragon stomps and roars, Level 3 has them shut their eyes, and dragon no longer roars. Level 4 has them face outwards from the circle with eyes shut.
Stoic - students must take up a stance and maintain a stern warrior's demeanor while you and an assistant or two try to make them smile/laugh. They must look directly at you (can't close their eyes or look away) while you are in their view.