And before that we’ll have people grimacing or laughing into their phones to make “secret expressions”

Actually that’d be a cool idea for an auto wipe feature! If you blink a Morris code SOS it should send out a 911 alert with your location and then permanently lock the phone.

Gesture controls are tricky, only a few applications of them make sense (like hand-to-fist for camera). Something like this would be the modern version of butt dialing 911, back when users would speed dial 911 unintentionally from sitting on their phone.