https://www.theguardian.com/technology/video/2017/sep/12/apple-iphone-x-facial-recognition-face-id-fail-launch-video

The iPhone X’s facial recognition system fails on the first attempt at the unveiling of the latest handset on Tuesday in California. Apple’s VP of software engineering, Craig Federighi, had to switch to a backup phone in order to demonstrate the face-unlocking feature after describing its ease of use