LOS ANGELES, Sept 11 (Reuters) - Nana and Pop Pop seem like the perfect grandparents. They bake cookies, go for long walks and volunteer at a local psychiatric hospital. But after the sun goes down, things get weird in M. Night Shyamalan's latest horror movie, "The Visit." The film, out in theaters on Friday, follows teen siblings Becca (Olivia DeJonge) and Tyler (Ed Oxenbould) as they are sent by their single mother to meet her estranged parents for the first time and stay with them for a week. Shyamalan, 45, known for supernatural movies such as "The Sixth Sense" and "Signs," channels his own teen filmmaker self into the precocious Becca, an aspiring documentarian who films everything during their visit, including the bizarre behavior of her grandparents as night falls. The film was... More