A German designer known as Seppoman has built a Midibox control system into a sofa.
If two people are seated on the sofa, they can output three control values each - left and right buttock weight and how far the person is leaning back. The possibilities are endless. What a way to play samples. Pretty cheeky.
For more info and pictures: http://22.214.171.124/~midibox/forum/index.php?topic=4901.0