The real stories behind the Hollywood backdrops

SO here’s the deal. The packet of Taytos (only slightly crumpled) in the back of the car goes to the person who can name the film this castle appeared in, says our guide/driver/family member.
I love car games, particularly ones with prizes, so I rack my brains as soon as the magnificent 13th-century Eilean Donan castle comes into view at the intersection of three sparkling lochs in the Scottish highlands.