Fifty Shades of Grey' Beaten by 'Captain Underpants' as Most

EL James' sexually explicit book wasn't as highly contested as a children's graphic novel about a caped crusader who fights crime in his underwear.

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Fifty Shades of Grey and Captain Underpants head US library

Fifty Shades of Grey' Beaten by 'Captain Underpants' as Most

Captain Underpants: The First Epic Movie - Toilet Terror Scene

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Captain Underpants' doesn't sit well with some