If you're a fan of rom-coms, there's a good chance that you've seen the same ones, again and again.
You've memorized the meet-cutes and could recite every last detail of the first kisses. But even some diehard fans still don't know everything.
Like, did you know that Mark Ruffalo hated that dancing scene in 13 Going on 30 or that Billy Crystal and Meg Ryan almost weren't in When Harry Met Sally?
For more shockers, here are 16 interesting facts.