While you are following Bald (the person who Ed thinks blew up the military car), go left when you first enter the sewers. There will be an object, and behind it is a cat in a cardboard box. Walk up to it and short intermission sequence will begin. Al will look at it, and take it while Ed is not looking. Equip this as one of Al's accessories. When you are not fighting, stop and call Al over. If you do not move for a few seconds, Al will decide to sit down, and a few seconds after that, the cat will meow and the word "-M-e-o-w-" will come out of Al's body.