Warren Beatty was accidentally handed the wrong envelope for Best Picture at the 2017 Oscars, announcing La La Land as the winner when it was actually Moonlight. This mistake occurred because Brian Cullinan, the chairman of PwC who was responsible for handing out the envelopes, had tweeted a photo of Emma Stone backstage just before the award was presented. The social media reaction to the error at the Oscars was immense, amplifying the story and adding to the chaos and confusion of the incorrect Best Picture announcement.