Two chaps called Hye Yeon Nam and Sam Mendenhall have apparently developed the ultimate casual game controller: two-players French kissing.According to the device's site:
"The Kiss Controller interface has two components: a customized headset that functions as a sensor receiver and a magnet that provides sensor input. The user affixes a magnet to his/ her tongue with Fixodent. Magnetic field sensors are attached to the end of the headset and positioned in front of the mouth. As the user moves her tongue, this creates varying magnetic fields that are used to control games."
Even better, "Kissing is an intimate behavior that can be developed into a game device. It has not yet been proposed in the game industry. Kiss Controller shows how the human tongue can be used to control a game and how people can become creatively involved in a game."