Make a circle and sit down. One person is IT and has the hanky (handkerchief). She walks around the outside of the circle and drops the handkerchief behind someone. As soon as that person realizes that the hanky has been dropped behind him, he gets up and runs around the circle twice, trying to tag IT. If IT manages (after two runs around) to get to the vacated place in the circle, IT is safe and the other person is IT. If IT drops the hanky and the person doesn t realize it, and IT walks around the circle once and tags that person on the shoulder, that person becomes IT.