"Take a working IR remote. Go into a windowless dark room, or some other place of complete darkness. Give your eyes a few minutes to adjust. Stick the remote's IR LED up to your face, and start pressing buttons. If you are like many people, you will be able to see a faint glow when you press the buttons."

When I tried the above at home, every time I changed channels with my remote I forgot what I was doing and began to obey the voices. After I wrapped the remote in white cloth, however, the voices stopped. Why is that?