Everyone sits in a circle and the it goes something like this: Person 1 to Person 2) "Would you like to buy a duck? Person 2 to Person 1) "A what?" P1 to P2) "A duck" P2 to P1) "Does it quack?" P1 to P2) "Of course it quacks it's a duck" P2 to P3) "Would you like to buy a duck?" P3 to P2) "A what?" P2 to P1) "A what?" P1 to P2) "A duck" P2 to P3) "A duck" P3 to P2) "Does it quack?" P2 to P1) "Does it quack?" P1 to P2) "Of course it quacks it's a duck" P2 to P3) "Of course it quacks it's a duck" P3 to P4) "Would you like to buy a duck" etc...