To do it, you’ll have to activate your web camera on your laptop or phone, and in a small picture-in-picture window alongside the film clip, you’ll see your own face smiling back at you. If you stop smiling like a maniac for even a moment, the playback pauses and turns to black, with a message that says “Keep Smiling.”

Watch a seven-minute free excerpt of Paramount's new horror flick 'Smile 2' online — but the grin you'll need to plaster on your face is not included.