It feels like it's been forever since Eli Roth directed a movie. Other than clinging to Tarantino's stardom and doing small parts in his movies, he seemed to have vanished from the face of the earth completely after Hostel 2 flopped (which he blamed on illegal downloading and pirating, and was justifiably correct in doing so.) He did a movie called The Green Inferno in 2013, which was meant in some ways as his own personal homage to Cannibal Holocaust (the title 'Green Inferno' was even taken from a line of dialogue from that film), but for reasons that are a bit complicated, it's been trapped in distribution hell for two years and so now there's this. Judging from this trailer, Knock Knock looks like it could be a good horror/thriller flick. Not to mention the likelihood of getting to see two hot chicks get nude at some point.