Horror films are made to frighten or shock the viewer through the means of the macabre, fantastic or supernatural, and thus frequently overlapping with science fiction. Perhaps more than any other genre, what is considered to be a horror film has varied from decade to decade. Suggested menace that was once clearly a provenance of horror now would be categorized as a mystery or a crime thriller (The Silence of the Lambs), with the term "horror" applied to films which display more explicit gore (Wes Craven's New Nightmare). These films frequently overlap with thriller, science fiction and fantasy.