Stone * Paper * Scissor *
http://www.crossingwallstreet.com/archives/2006/07/brain_teaser.html
"The Micronesian island of Yap is famous for its stone currency, known as Fé: large donut-shaped, carved disks of (usually) calcite, up to 4 m (12 ft) in diameter. The islanders know who owns which piece, but do not necessarily move them when ownership changes; their size and weight (the largest ones require twenty adult men to carry) make them very difficult to steal. There are five major types: Mmbul, Gaw, Ray, Yar, and Reng."
Fé
Fiat
Paper
Manjusri
"The Micronesian island of Yap is famous for its stone currency, known as Fé: large donut-shaped, carved disks of (usually) calcite, up to 4 m (12 ft) in diameter. The islanders know who owns which piece, but do not necessarily move them when ownership changes; their size and weight (the largest ones require twenty adult men to carry) make them very difficult to steal. There are five major types: Mmbul, Gaw, Ray, Yar, and Reng."
Fé
Fiat
Paper
Manjusri