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What Little Detail In "Harry Potter" Totally Blew Your Mind?

This series is cleverer than Hermione Granger.

Harry Potter! We love it for a whole bunch of different reasons. But one of those reasons is that – even though it's technically a ~children's series~ – it's actually really damn clever.

Re-reading the series is always a treat, because you can spot little things in the earlier books that hint to plot points in the later ones.

Of course, there's also smaller things, like this line in Philosopher's Stone where you realise the Weasley twins are throwing snowballs at Voldemort's face.

And then there's this adorable touch: Ron's Patronus is a Jack Russell terrier. Jack Russells are known for chasing otters – and Hermione's Patronus is an otter.

So, tell us what your favourite clever detail is in Harry Potter, and your submission could be featured in a future BuzzFeed Community post or video!