Give everyone a 3x5 card. Have them all write down 4 things about themselves that no one else in the room should know. Have them put their name on the top of the card for future reference. Collect the cards. Then pass out a piece of paper to each person. Read the cards one at a time and have everyone write down who they think the person on the card is. Then read off the correct results (the names from the top of the cards) while they check their lists. The person who gets the most right is the winner.