A running joke in Rian Johnson's surprising hit mystery, Knives Out, is the fact that the members of an upper-class family in Massachusetts can't recall where their caregiver is from. They tell each other (and others) that she is from Paraguay. Or Uruguay. Or that her mother in an illegal alien from Brazil. It doesn't really matter to them -- she's just a disposable household artifact coveted by patriarch Harlan Thrombey (a reverent Christopher Plummer), whose demise sets up