Mr Chen
Chen The Chem or Tenko

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A chemistry teacher, Chen the Chem I think was from Hong Kong. He was prone to startling Kung Fu like standing jumps up onto the work benches. He also had an original method of punishing ill behaviour by pouring a beaker of cold water down the back of your neck. Because of this cruelty he acquired another nickname, Tenko.
(DB 84-91)