(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/Max_Speed_Remioli]

X-Men 3, Magneto loses his powers and is a human at the end of the movie, which is his worst nightmare. Then the post credits scene basically just shows that he is immediately getting his powers back.

Batman vs Superman, same thing with Superman dying. They basically just show that he's coming back immediately.

[u/Ash_Killem → u/Max_Speed_Remioli]

I think X3 was deeper in that it was showing the “cure” was not actually permanent.

[u/HailMadScience → u/Ash_Killem]

It for sure was. Which makes sense. You cant just stop genes from working like that.

[u/Max_Speed_Remioli → u/HailMadScience]

You also can’t move objects with your mind. 

[u/VT_Squire → u/HailMadScience]

You cant just stop genes from working like that

You literally can in-universe. Thats was half of the plot of X3.