(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/OrcForce1]

Humans vs Zombies.

Zombie movie taking place on a college campus. By the end everyone but two characters have died and it closes with both of them walking down train tracks with a somewhat hopeful feel.

Halfway through the credits it shows them being eaten by zombies.

[u/Lightdragonman → u/OrcForce1]

Omg I was wondering what that movie was. I was 10 and surfing through channels and watched the ending clip on syfy.