I LOVE doing this activity with my students during the first day/week of school. It's like the game of "red light/green light" with a little twist of what kids THINK they know about you. You will list out some true and false facts about yourself. Kids will line up at the back of a room/playground, etc. If they think it is true, they'll step forward. If they think it's false, they stay put. If they get it wrong---they go back to the beginning line! First one to you is the "winner!"
Read a little more at my blog and pick up a freebie to help you plan (planning is much easier with this as it's often hard to think of things on the spot about yourself)
Have a great week!