Piers sez, "A couple of Christmases ago, my friend Harry made me this wristband out of an orignal NES controller. He stripped the PCB, wiring and buttons out of it, and baked it in the oven over half a tin can, bent to form-fit his wrist. It melted over the can, then he took it out, put the buttons back in, glued it and sealed it with silicone or something. He even shortened the cord and had it coming out the end so the plug could join on to a loop of elastic to hold it on."
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(Thanks, Piers!)