My cat LOVES alum. foil! I discovered this once when I used it to cover a piece of furniture that a cat had previously had an "accident" on. A couple different cat advice books said to clean it then cover with foil to keep the cats off, because cats are suposed to hate the feel and sound of it. Well, one of my cats would not go anyway near it, but the other we would find sleeping on it during the night. Then after a day or two, he started playing in it. He was jumping on it, then spinning around & pouncing, etc.