Dunkirk
It’s often said that one bad apple’s enough to spoil the bunch. In Christopher Nolan’s World War II epic Dunkirk, the bunch was spoiled before the movie ever came out. Nolan crafted a masterful teaser, building suspense while revealing little action.
It would’ve worked if not for one extra. In a scene showing Allied soldiers on a boat, everyone looks up at the sound of an oncoming German plane.
Sadly, the palpable tension is somewhat undercut by an extra who can’t stop smirking. It was so bad that for the DVD release his face was digitally altered.