In Silent Library (????????, Sairento Toshokan), the cast and a sixth member, usually Heipo, are in a staged library in which one of them has to undergo a punishment upon choosing the card with the skull and crossbones on it (similar to Russian roulette). Although the game requires that they remain silent during the entire segment, the members repeatedly let out bursts of muffled laughter that is loud enough for the occupants of the library to hear. An example of punishments are being "Outwitted" (having a nose hair pulled from the nostril), "Nose Fishing" (a metal clamp attached to the inside of both nostrils being pulled), and "Hot Earmuffs" (boiled earmuffs put on both ears). Former K-1 champion Ernesto Hoost once made a special appearance, as well as comedian Koki Mitani.
This segment has been adapted into an American game show, called Silent Library. It debuted on MTV on June 15, 2009. While the international version is referred to as Fist of Zen.
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