"SmileCheck enables a new type of picture taking mode called “Smile Shutter” in digital cameras. Once the camera’s trigger button is depressed, the shutter is not engaged until smiles are detected on all faces within the frame, ensuring photos with all smiles."
Nope, it's not the first of April.
I would have thunk such a product would have come from Japan. (But they seem to be doing a lot better with hardware.)
I once had a camera manual, clearly translated from Japanese, which said: "the diode by the self timer will blink faster during the last two seconds, so you know when to smile."