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Named for Norman Bates, the mentally unstable antagonist of the film Psycho, a Bates is a person who never threatens anyone's life directly, but very obviously gives off the "I'm going to kill you in your sleep and roll around in your blood giggling like a schoolgirl" vibe. A Bates is almost always completely oblivious to the fact that they're a Bates. Also usually very poor at reading hints to leave others alone.
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