Fishnet Ninjas

fishnet ninjas , n. refers to unfair actions or decisions made by a gamemaster. Also "ninjas with fishnets." See DMAA, snap plague. [GJ1]
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Addendum: Many years ago, there was a long-running weekly AD&D at a game store in the west San Fernando Valley, attended largely by munchkins. The dungeon master (you know who you are) felt that the players were not taking the plot of the game seriously enough, and decided to punish them. The party was suddenly attacked by a squad of ninja, who caught every player in fishnets. When one player tried to cut through the netting with his magic sword, the DM replied that the player couldn't get his sword in the right position. When another player tried to use his 18/00 strength to tear the nets, the DM replied "you don't have 18/00 strength in your fingers." Anything the players tried to escape from the nets failed for ridiculous reasons, without any die rolls. The players realized that the DM was unfairly (and unimaginatively) restraining them, and were thoroughly disgusted. Thus, "fishnet ninjas." [GJ1]
Addendum #2: In a D&D campaign we ran there was an equivalent villain presented by the DM: The 20th Level Magic User Who'd Thought Of Everything. [MW] See also telepathic guard.