Landon discovered the crinkle sound from the outdoor adventure mat that we have for the Wii. It sounds like tissue paper inside and makes lots of loud sounds. We can not keep the little rascal away from it. We remove him from the room and he zooms back in and gets in the way. When it is his turn he goes crazy, like a dog chasing his tail. Squeals of delight abound! It must be a baby thing!