Trouble

This can only be trouble. Some students with too much time on their hands are working on a way to let your facial expressions control computers. Their example is a lecture - if you smile, it speeds up, if you frown, it slows down.

Using your face for remote control

Here's what's going to happen. You sit in the living room, watching the soccer game. In comes your wife. She sees what you're watching, and frowns. Click, now you're watching a soap opera.