Its “ki ki ki, ma ma ma” not “ch ch ch ha ha ha”. Friday the 13th and its franchise series is probably the most successful rip off movie of all time. Friday the 13th and many of the slashers of the 80s were copying each other and all trying to imitate John Carpenter’s Halloween. This isn’t a bad thing. Imitation is the greatest form of flatery and it produced some delightful and hilarious gems. More info