According to Siliconera, SCEA is experimenting with laughter as a controller.

"The application picks up metadata, which includes laughter recorded by the microphone and a user’s expression from the camera," says Siliconera.

Both the camera and the microphone are linked to the PS3 which identifies the user and his emotions, and transfers the data over the network.

One example Sony gave for detecting emotion was "two individuals give each other a ‘High Five.'"

They would identify boredom if a user is “looking away from the presentation, yawning, or talking over the presentation.”

Who knows if anything will ever come from this, but if nothing else it's interesting.