LONDON -- There's a reason you never catch Dementors in water,Italy and it's not because they don't like getting their cloaks wet.

The real reason is obvious: there are far too many magical fish out there that would blast them into oblivion with their tiny, adorable patronuses.

SEE ALSO: 'Harry Potter' fans, rejoice: You can now discover your true Patronus

Just look at this one in action:

Mashable Trend Report Decode what’s viral, what’s next, and what it all means. Sign up for Mashable’s weekly Trend Report newsletter. By clicking Sign Me Up, you confirm you are 16+ and agree to our Terms of Use and Privacy Policy. Thanks for signing up!

OK, so it's probably worth mentioning at this point that fish can't really cast Patronuses (at least not that us muggles know about, anyway).

The little cardinal fish in the BBC Earthclip above -- which went viral after it was shared recently on Twitter -- is actually regurgitating a creature called an ostracod, which gives off that bright blue light when swallowed as a form of defence.

Then again, who knows? Maybe that's what they just want usto think.

Featured Video For You
Voldemort isn't as terrifying as you think