Did you know Billy Crystal’s ad-libs in "The Princess Bride" were so funny they had to remove people from the set? Or that Mandy Patinkin bruised a rib trying not to laugh during one of his scenes?

Hellmann's, the Unilever-owned mayonnaise brand, reunited Billy Crystal and Meg Ryan as their titular characters from the ’80s rom-com “When Harry Met Sally” for a Super Bowl spot commercial ...