Hey BlackHatWorld, what's the weirdest niche market you've come across, barring the sexual ones? I found quite an interesting one when I started playing piano about 2 years ago. It's the perfect pitch market. There are dozens of websites and books devoted to "teaching" people how to aquire perfect pitch, which is the ability to hear any note played on any instrument and name it. It's a neat party trick within music circles, but it's pretty useless for any practical music stuff Thing is it's not possible to learn perfect pitch, so it's just a scam market. You have to take vigorous music lessons at a very young age to aquire it. If you don't, you lose out on it forever. What are other one-offs like this that you guyd can think of?