Cats just love to swat at anything on a string -- even a simple piece of paper. But that game normally requires a human partner to hold the string up and bounce the toy up and down. Knob Goblins are little catnip-filled critters that have elastic strings attached so that you can hang them on a doorknob. When your cat finally grabs the googly-eyed creature the elastic string will shoot it back up, driving kitty into a fun-filled frenzy. Choose from three different Knob Goblins: flamingo, goblin, or spider.