Plot: Two siblings from Philadelphia, 15-year-old Becca and 13-year-old Tyler, prepare for a five-day visit with their grandparents while their divorced mother Loretta goes on a cruise with her boyfriend. Loretta reveals that she has not spoken to her parents in 15 years after marrying her high school teacher, of whom her parents disapproved. Having never met their grandparents, the teenagers intend to record a documentary film about their visit using a camcorder. Becca and Tyler meet their grandparents, referred to as "Nana" and "Pop Pop", at a train station. When they arrive at their isolated farmhouse, Becca and Tyler are instructed to never go into the basement because it contains mold, and that bedtime is at 9:30 every evening, after which they shouldn't leave their room. The first night, an hour past curfew, Becca ventures downstairs for something to eat and sees Nana projectile vomiting all over the house, which frightens her. She tells Pop Pop, who dismisses it as Nana having the stomach flu. He then reminds her not to leave their bedroom after 9:30 pm..
Alternative Plot: The lives of uptight conservatives Chidi and Eugenia are thrown into disarray when a loudmouthed, hard-partying new couple moves in next door. When they come over for a visit, both couples realize that their marriages have secrets.
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