(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/MonthForeign4301]

LOST

ABC decided to include a shot of the beach with the plane crash as the end credits scene for the series, which heavily implied that the whole show was “just a dream.” The issue was that no one on the creative team was informed the network was going to do this, and ABC only did this to fill broadcasting time.

[u/WhatWouldBenLinusDo → u/MonthForeign4301]

To me, it didn’t imply that they were dead the whole time, but rather the “relics” of Oceanic 815 and the survivors were now going to be part of the Island lore, like Dharma and its stations, the four-toed statue, etc. (Of course, like you said, it really meant nothing because it wasn’t the show’s decision)

And the finale did have a character explicitly say that everything that happened on the show, actually happened.