Strange things your pet is attracted to

I have a young cat who goes crazy for a crumpled piece of paper. We have bought her numerous toys that she will play with for a moment and then discard. yet as soon as she hears a piece of paper being crumpled in another room she pretty much begs for you to throw it and will bat it around the house for hours! often she will play fetch and bring the paper ball back. it's hilarious how her ears perk up at a crackle.