The Stree movie is based on the Nale Ba story. Before the times of virality on the Internet, in the 90s, in Bangalore, there was an urban legend that became extremely notorious. Legend has it that a female bridal spirit roamed the city at night looking for her dead husband. She was known to steal men from their houses. She would knock on the door of a home and would be able to mimic the voices of the members of the family. This would trick the male resident to open the door for her to take him. After that, the people of the town starting writing Naale Ba, meaning Come tomorrow on their doors. When the spirit showed up, she'd read that and return the following day, and this recursive cycle would keep the family man safe. Nale Ba is Stree's real story which was adapted into the screenplay.