The classic xxx movies - watch full movies for freedocumentaries of David Attenborough have been delighting the UK for decades.

SEE ALSO: This giant fish that gulps down birds is the stuff nightmares are made of

But in with the wonder of nature, the BBClikes to mix a healthy dose of horror.

Along with adorable fishies and turtles, this Sunday's Blue Planet II featured a creature straight out of your nightmares.

Enter the bobbit worm.

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One. Metre. Long.

The sea is basically full of sci-fi horrors.

As well as being pretty freaked out by the Bobbit in general, many were puzzled by its name.

Well the internet asked, and the internet answered.

Why. Why would you do this to us, science?

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