It always seemed to me that Microsoft Barney was a powerful toy. It could be connected to a PC (running Windows of course) and data in the form of sampled speech could be uploaded into it (through a port in Barney's butt).
I have always wondered if there was a way to modify Barney into a swearing, foul-mouthed monstrosity through data uploaded into him. If anyone has information on Barney-hacking please tell me!