The House of the Devil (2009)
College student Samantha Hughes (Jocelin Donahue) takes a babysitting job to help pay for an apartment. It seems like a normal gig until she arrives at the home of Mr. Ulman (Tom Noonan) and his wife (Mary Woronov). Rather than watching a child, Samantha is asked to watch Mrs. Ulman's ailing mother. And by "ailing mother," we mean a wicked witch who needs Samantha's blood to complete a ritual.