I do this the first week of school. What the kids do is simply write 3 things about themselves that no one else knows. Once everyone is finished, they crumble the paper up into a ball and stand in a circle (can be inside or outside depending on how much room you have). I have my kids close their eyes, and then everyone throws their "snowball" into the middle of the circle. Next step, everyone goes to the middle of the circle and gets a "snowball" and reads the 3 facts. Students will walk around the room asking the specific facts to see who they belong to. Once done, everyone sits in a circle. Each student introduces the person whose snowball they found. It's a great movement activity that the kids all seem to love.