A drug used on King Mob in Grant Morrison's "Invisibles". Key 17 causes the user to perceive written words as if they were the actual objects they describe: King Mob is shown several scraps of paper with the word "finger" on them, and is convinced his own fingers have been severed. He uses Key 17 to his own advantage later on, stopping an assailant by showing him a "World's Greatest Dad" mug (the assailant, of course, sees the World's Greatest Dad and becomes very emotional).
It is suggested at http://www.barbelith.com/bomb/ that Key 17 is 'inspired' by the Philip K. Dick novel, Time Out of Joint.

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