I was looking up möbius strips online, and naturally wandered into klein bottle territory, and ended up at http://www.kleinbottle.com. It's reading week, and I'm in the university's computer lab. Heaven protect me if an overworked English Major comes over and asks why I'm disturbing the peace with choked laughter... This guy is serious. He is really selling Klein Bottles. And having more than his fair share of fun doing it, it seems like.