Robert Hammer is a notable figure in the realm of physical media, especially recognized for his work as a producer on cult classic horror films. One of his most significant contributions is to the 1980 slasher film "Don't Answer the Phone!" which has garnered a dedicated following among collectors. This film stands out not only for its gritty portrayal of a deranged killer but also for its unique place in the pantheon of early '80s horror, making it a prized possession for fans of the genre. Collectors seek out Hammer's work for its impact on film history and the nostalgia it evokes. The original VHS and later DVD releases of "Don't Answer the Phone!" are particularly sought after, often fetching high prices on the resale market. Hammer's ability to tap into the zeitgeist of the era has ensured that his films remain relevant and desirable, solidifying his legacy in the annals of home video collecting.