A couple noticed their baby goes absolutely NUTS every time they hold the TV remote in front of him. The great thing is they don't even try to make it entertaining. He's just legitimately FASCINATED by it.
You can't see the front of the remote, so it's not clear if lights up or something. But he can't get enough of it. Then as soon as they pull it away, he goes back to normal. (Search for "Silly Baby Boy Goes Crazy Over a Remote Control.")