Pet rocks made a lot of money for a few people for a while which was the purpose for the whole thing. Their popularity just gave way to the next craze. Guess it depends upon what one means by not catching on. On the other hand, "New Coke". Millions of dollars in promotion. Absolute proclamations by the company that New Coke was here to stay. I can't speak for the rest of the country, but Pepsi sales in the concession stand I operated mushroomed. And then its gone. I nominate New Coke.