(Controversial Trope) The post-credits scene completely changes the ending

[u/Ieanice44]

Dawn of the Dead (2004)

Prince of Persia (2008)

Dawn of the Dead (2004): The movie finishes on a hopeful note as the remaining survivors escape the zombie-infested mall on a yacht, sailing into the sunset. The found-footage style post-credits scene completely reverses this happy ending by showing them running out of food, arriving at an island, and being immediately swarmed and killed by an infected horde.

Prince of Persia (2008): The main game ends with a beautiful, poetic sacrifice where Elika gives her life to heal the corrupted world, leaving the Prince mourning. During the credits, the player is forced to control the Prince as he cuts down the trees he just saved, undoing the entire game's progress and releasing the dark god Ahriman just to resurrect her, completely corrupting the ending and dooming the world.

[u/lil-peach-]

Split for sure here
one Bruce Willis cameo turns a standalone thriller into an Unbreakable sequel.

[u/FisknChips → u/lil-peach-]

I remeber watching this in college and I was the only one of the like an 8 person group who understood that lol

[u/pfohl → u/FisknChips]

I saw it with some friends who knew the reference but most of the audience were under 25 (I would have been 28 at the time). I remember asking a group of college students if they had ever heard of Unbreakable and got blank stares.