In front of a large audience, a man is asked to complete a memory challenge: what is his online banking password? There are gasps from the audience, and as the clock counts down from 15 seconds the man starts to panic. Did it have an ampersand? An underscore? As if to help him remember, the man looks at the banking app on his iPhone, when suddenly, it unlocks with Face ID. Apple says that with the iPhone X, your face is your password.