The tiny frog man.
Years ago, this toy company released a science kit for kids that helped you take apart a live frog and put it back together with its bones in a different configuration. It would walk around on two legs like a person, grabbing flies with its hands and popping them into its mouth. It was such a cool little kit, but animal rights activists complained and they had to take it off the market. I have one, but since I already used it once I can't use it again because they stopped selling the refill kits for it. I've been offered almost a thousand bucks for it since it's now a collector's item.