Divide the class into two teams. Line up the players. If there's an odd number of players, one can be the teacher's "helper". The teacher or his helper whispers a message to the first person of both group A and group B. The game only starts when both players know the message. Then each player whispers the message to the next player in his group sucessively until the last player gets the message. The team which can repeat the message first and correctly receives a point. Start the game over with the second student of each group becoming the first ones in line.
Submitted by Vera Mello