Asian martial arts films began appearing as imports regularly during the 1970s. These "kung fu" films as they were often called, whatever martial art they featured, were popularized in the United States by the Hong Kong–produced movies of Bruce Lee and marketed to the same audience targeted by AIP and New World. Horror continued to attract young, independent American directors. As Roger Ebert explained in one 1974 review, "Horror and exploitation films almost always turn a profit if they're brought in at the right price. So they provide a good starting place for ambitious would-be filmmakers who can't get more conventional projects off the ground." The movie under consideration was "The Texas Chain Saw Massacre". Made by Tobe Hooper for less than $300,000, it became one of the most influential horror films of the 1970s. John Carpenter's "Halloween" (1978), produced on a $320,000 budget, grossed over worldwide and effectively established the slasher flick as horror's primary mode for the next decade. Just as Hooper had learned from Romero's work, "Halloween", in turn, largely followed the model of "Black Christmas" (1974), directed by "Deathdream"s Bob Clark.