Unpopular Opinion? The movie Charade. Cary Grant and Audrey Hepburn have zero chemistry and her acting feels so incredibly forced to try to make chemistry exist where it doesn't. The whole movie comes off as really weird because he's so much older than her, the casting itself feels poorly thought out... like casting Ashton Kutcher with Katherine Heigl... basically, chosen for their looks and popularity. It just does not work.
I love Cary Grant in almost everything, and Audrey is great in Breakfast at Tiffany but she's a line trick pony and the trick doesn't work here.