Kenichiro Imaizmu, producer of the Metal Gear Solid series at Kojima Productions, has revealed that Hideo Kojima had tried to build his own controller for Metal Gear Solid 4.
“We tried running electric shock waves, install a pulse reader … we also tried to build a controller that’s receptive to the strength of the [player's] grip,” he said. “We tried a lot, even a transforming controller.”
Sounds a bit painful, that shocking bit.
More over on Joystiq.