Bonanza - Season 1 Episode 21

In "The Spanish Grant", a young bargirl, Rosita Morales is pretending to be a Spanish noblewoman named Isabella Marie Inez de la Cuesta and at the end of the story, it's revealed she is really Rosita Morales, but on the other hand, is she really Rosita Morales? This little twist at the end is simply entertaining everytime it's viewed, with the viewer able to determine the young woman's real identity at the end of act four.