Fairy tales may seem fun and whimsical and sweet now, but the histories of most of them are dark and truly terrifying. Perhaps you are familiar with Hans Christian Andersen, who penned the original 'Little Mermaid' fairy tale, one that ended, well, it just ended very differently than the Disney version. But Andersen wasn't the only author who used his fairy tales to freak kids out. Over in Germany, Heinrich Hoffmann did the same thing with his 'Der Struwwelpeter,' and guess who grew up reading it?

Charming 'Orphan Black' star Tatiana Maslany! The actress took some of her 'Struwwelpeter' stories to 'Conan' last night, and even O'Brien was taken aback by some of the more vivid imagery in the book. Night night!

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