Mummy an' the Armadillo

Set entirely at a run-down roadside diner in Arizona, called The Armadillo Cafe, a shady tourist, named Sarah, stops for a rest at the deserted place run by a wary young woman, named Billie, and her dysfunctional and deranged family whom include her psychotic, alcoholic mother Let and her two sons; the retarded Wyatte and the crazed cowboy Jess... (IMDb.com)