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http://www.imdb.com/title/tt0063729/
Twisted Nerve is a 1968 British psychological thriller film about a disturbed young man, Martin, who pretends, under the name of Georgie, to be mentally retarded in order to be near Susan, a girl he has become infatuated with, killing those who get in his way.
Full Movie
This film was outstanding! Creepy, tense, insane.. The whistling Martin does sent chills through me. Fuck. 9/10. Yes, a nine outta ten!