The face Calvin makes when he increases the size of his brain and starts to "unravel the mysteries of the universe" is rather creepy.

Calvin also has a habit of making disturbing slasher smiles.

Occasionally, Calvin doodles disturbing drawings in his notebooks, including Hobbes surrounded by human heads, and writing macabre stories such as The Dad Who Lived to Regret Being Mean to His Kid and a gory version of Goldilocks and the Three Bears.

In fact, what Nightmare Fuel there is usually comes from Calvin.

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