10 More Movie Mistakes You Can't Believe You Didn't Spot

Now this one's really weird, and will forever change how you view the Battle of Helm's Deep in the second Lord of the Rings movie. So, you've been warned.

Early on in the battle when Aragorn (Viggo Mortensen) signals his archers to fire, he does so with his sword, which strangely... vanishes into thin air on the downstroke.

As Aragorn swings it towards the screen, only the hilt remains visible in his hand, with the actual blade component of the weapon magically nowhere to be seen.

Fans have theorised that this was most likely a VFX-related gaffe, that part of the shot was masked to enhance the background of the scene - likely adding more archers behind Aragorn - with the sword's blade accidentally getting erased also.

For a film that's so meticulously crafted, it's quite the odd mistake, and yet the moment passes quickly enough that it's relatively easily missed amid all the battle's excitement.