A tin animal noise maker. My baby will crawl miles for it. Baby bored? Show him the noise maker. Baby crying? Give him a glimpse of the noise maker. Instant trance. It rolls. It makes noise when baby shakes it. It’s great. You can get one like ours here. But I bet you could get 5 for $1 at a dollar store if you look. I also found this really cool looking set (if you want to go all out on the deluxe model).