After an enticing build-up, the film version of E. L. James’s Fifty Shades of Grey has finally arrived. The entire franchise may not necessarily be a stroke of literary genius — it is basically Twilight fan fiction, after all — but it didn’t deter millions of hormone-addled fans from reading every sentence. But we’re betting even the most hardcore Grey fan will struggle to complete our challenge: Can you differentiate lines of Fifty Shades from R. Kelly lyrics?

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