12 More Movies You Didn't Realise Stupidly Broke Their Own Rules

10. You Have To Destroy The Horcruxes - Harry Potter

The Rule:

It's simple really, destroy the Horcruxes, kill Voldemort. Specifically, you have to ensure the container is destroyed beyond magical repair.

So, when each of the Horcruxes is destroyed, the vessel is destroyed. The Ring is smashed, the diary stabbed and ruined, the locket basically explodes... It's a fairly well established rule.

The Breaker:

When the idea of Horcruxes is introduced in The Half-Blood prince, it is immediately established that the only way to stop Voldemort from being immortal is to destroy each of the seven Horcruxes containing fragments of his soul. That lasts all the way up to the rather grim revelation that Harry is a Horcrux and thus has to die - a secret Dumbledore has been keeping for years.

But then, actually no, that's not the whole story. In reality, you can "kill" the Horcrux, which is for some reason reimagined as a Voldefetus without destroying the vessel when it's Harry Potter, who is protected by his mother's love and a bond to Voldemort. For some reason, the Horcrux is not protected by any of that, and can be destroyed with a killing curse. Even though it is only questionably alive.

Stop asking questions.

It's what is rather poetically known as an almighty ass-pull - a narrative contrivance of convenience of the utmost degree.