"Se7en" (1995) - Another Fincher classic, "Se7en" concludes with a grim and unforgettable twist. The final sin, envy, culminates in a devastating act involving a box, the killer John Doe (Kevin Spacey), Detective Mills (Brad Pitt), and his wife. The ending is as shocking as it is tragic, cementing "Se7en" as a masterpiece of the thriller genre.
These movies exemplify how a shocking ending can be a powerful storytelling tool, leaving a lasting impact on the audience and often redefining the genre in the process.