As you watch a movie, ask yourself What If…. What if the heroine didn’t live? What if they were wrong in their guess? What if one character acted differently or made a different decision? Question the plot, the characters, everything.
Watching movies and getting inspired is not stealing unless you use the exact storyline and characters to rewrite your story. Let the movie have you creating different stories and scenarios. Think about how many stories are similar that you have read and watched. Writing a story where the villain reveals to the hero/heroine that he is their father is not stealing from Star Wars. Many, many stories have that plot. It inspired others to have that the same but everything else different. Muses were inspired.
Movies are great inspirations. I watch them and suddenly a new story idea hits me. What if someone was abducted ike aliens as in the movie but...they are really aliens put undercover on Earth and didn’t know it? What if it is a trap for the aliens? I take a similar piece of the story from the movie and let my muse go nuts. It’s so much fun.