Actually, in my previous life I was an engineer in the glass industry. One day my wife called me and said there was a frog in the toilet. I had heard of this, but never actually saw it. I came home and there was a Cuban Tree Frog stuck to the side of the toilet bowl. Being the curious Clemson graduate I am, I investigated how they end up there and found they come down the vent. Later, a building inspector told me that someone needed to do something about the lead flashings, they are always getting chewed up and he failed a lot of homes because of it. I didnt think of it, but later I lost my job during the recession and had to do something, and came up with Critter Quitters. Made them in my garage at first, and now they are fully injection molded. An American success story.