How about the Crawl-a-gator? I had one of these before i could walk. it was a large flat piece of plastic, shaped and colored to look like a cartoon aligator that had castors on the bottom. I guess it was supposed to help kids who couldn't walk yet learn the concept of movement and show them how to crawl in that position. Problem was, kid's fingers kept getting crushed under the castors and weight of their own body. Hell, i didn't learn to walk until i was 7 years old. :D