Safety razor become locked into buying their proprietary cartridges, for as long as the manufacturer continues to make them. Subsequent to introducing the higher-priced Mach3 in 1998, Gillette's blade sales realized a 50% increase, and profits increased in an otherwise mature market. The marketing of increasing numbers of blades in a cartridge has been parodied since the 1970s. The debut episode of "Saturday Night Live" in 1975 included a parody advertisement for the Triple Trac Razor, shortly after the first two-blade cartridge for men's razors was advertised. "Mad" magazine announced the "Trac 76", arranged as a chain of cartridges with a handle
A Blade in the Dark and neighbors are murdered by a razor-wielding slasher, and there is a weird next door neighbor who is a key suspect. Lamberto Bava was offered to direct "A Blade in the Dark" while he was assisting Dario Argento on "Tenebrae" (1982). The film was written by the husband and wife writing team of Dardano Sacchetti and Elisa Briganti. Bava and Sacchetti recalled that their collaboration was difficult, with the two being more friendly during the production of "Twitch of the Death Nerve" (1971), but their approach to this film was at odds with each other. The film was initially commissioned