...make sure you don't wear slippers.
http://www.youtube.com/watch?v=DcsXQK8gpvo

Just kidding, they really don't attack all slippers...just those ones. My poor mother, I did warn her what would happen if she put them on though. I found them in my closet the other day, Nebo used to go after them when he was a puppy too. He doesn't seem to be interested in them now, he just wanted somebody to throw his favorite toy (which I did, after taking the video).