Write a (famous) person on the paper.
Put it on the forehead of the person next to you.
You are going to walk around and ask someone a question to guess who you are. The other person can only answer with yes or no. If you asked 1 thing and you answered 1 thing, you are going to search for somebody else and ask another question to figure out who you are.
If you guessed it right, sit down on your place. Other may come to you for questions, you may answer yes or no, but you can't ask any questions yourself (because you already got it).