Tape SM references to the backs of the chairs (where their back rests against it.) Each chair can have several references and each reference should be put onto 3 chairs. In the center of the circle, place the bone (eraser or a piece of candy, etc.). Teacher reads a SM clue and the three students who have that reference on their chair race for the bone. (Be careful so no one gets hurt). After a while, have the students switch seats so they are responsible for different SMs.