3. Zombie Pirate Powers - Pirates of the Caribbean
Rule: The Curse of the Black Pearl renders pirates immortal and able to sense the remaining Aztec coin needed to cure their malady. Here's an instance of breaking a clearly-established rule out of pure convenience, hoping you won't think about the narrative trajectory too hard. The Curse of the Black Pearl causes all afflicted pirates to turn into essentially powerful zombies, and the only cure is to return every last piece of Aztec gold to its chest. They're able to sense where the coin is, and also are essentially immortal while cursed, meaning that in theory, finding the coin should not be all that difficult. Of course, the film soon enough forgets these clearly-delineated rules when Elizabeth (Keira Knightley) shows up brandishing the lost coin. She threatens to drop it into the sea, which terrifies all the pirates, as they seem to conveniently forget that they could easily just dive to the depths of the ocean to reclaim it, and even if they can't see, they will be able to
sense where it is. But they're in the rather shallow harbour of Port Royale anyway, so even that doesn't really fly. What a joke.