Speaking of swords (check my previous fun fact), according to the film’s screenwriter, Terry Rossio, Will Turner (Orlando Bloom) is the best swordsman, followed...
Several elements - like hummingbirds flying backward (the only bird in the world that can), cyclones spinning clockwise in the Northern Hemisphere and counterclockwise...
The film’s sound effects were made using traditional methods:
Biting flesh was simulated by biting sausages.
Bloodsucking by drinking yoghurt.
And the sound of...