students are standing in a circle, chose one student to be the first greeter.
The greeter walks (or another previously determined movement, such as hopping,
skipping, tip-toeing, etc.) clockwise around the outside of the circle, chooses
a student by tapping her on the shoulder, and then continues around the circle.
The tapped student leaves her spot and travels, using the agreed upon movement,
counterclockwise around the outside of the circle. When the two students meet,
they stop and greet each other (using a previously selected greeting-handshake,
high 5, bow, Howdy, greet in a different language, etc.). The student who was
tapped now becomes the greeter and the other student returns to his seat. This
continues until everyone has been greeted.