There was a huge scandal involving the Rumble Pak and the Dual Shock. The motor inside the rumble pak is a patented product. Nintendo, however, patented the idea of putting that motor in a case and making it work with the controller and thus leased the motor from the company. Sony then bastardised the idea and did not lease motors from the company and were consequently sued. Pwned.
I'm a retarded fanboy, yes.