Chinese water torture

Torture method

Chinese water torture or a "dripping machine" is a mentally painful process which cold water is slowly dripped onto the scalp, forehead or face for a prolonged period of time. The process causes fear and mental deterioration on the subject. The pattern of the drops is often irregular, and the cold sensation is jarring, which causes anxiety as a person tries to anticipate the next drip.

This keyword could refer to multiple things. Here are some suggestions: