Gamester has a line of game controllers called the Clash Pads that let you deliberately interfere with and take over your opponent’s controller:
Press a button on your controller and the matching controller will start acting up. Buttons will stop working or will act like entirely different buttons, or you can take command of the other player’s controller, allowing you, for example, to seize control of your opponent’s car in a racing game and run it off the road. The effects are temporary and your controller can send only one effect at a time, with an indicator randomly blinking over an icon indicating what will happen when you press your clash button.
Sounds to us like it would completely take all the fun out of playing video games, but what do we know?
