Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

Q: Throughout Blade Runner we see Gaff (Edward James Olmos) making origami figures at various points in the movie. He makes a chicken, matchstick men and at the end of the film there is a unicorn waiting outside Deckard's apartment.    There is a great deal of discussion out there regarding the unicorn in particular, and how it indicates that Deckard is a replicant. I think an answer regarding the use of origami in general will be interesting new ground to cover.  Why origami? What does the origami represent in Blade Runner?

A: What does the origami represent in Blade Runner?
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Q: In The Exorcist, why does the demon that possesses Regan react to the “fake” holy water sprinkled by Father Karras?  It's hard to believe that the demon mistakes the tap water for water blessed by a priest. It certainly makes the entity that much less frightening.

A: Why does the demon that possesses Regan react to the “fake” holy water?
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Q: In Interstellar, after Cooper arrives in the Tesseract, Cooper tries to send the message STAY to his daughter in the past so she won't let him go on the mission. If that was his intention then why did he send the coordinates of NASA afterwards? If he didn't send the coordinates, he wouldn't have found NASA or go into space, he would have stayed.

A:
If Cooper wanted to stay, why did he send the NASA Coordinates?
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