In high school they invent a spray that stinks terribly, they market it and become rich.
Certain diabolical ideas can be really brilliant. For Andrew Masters and Alan Whitman, luck came during high school, when they wanted revenge with a professor they just couldn't stand.
Alan, given a small chemist's kit as a gift, strove to recreate the most annoying smell possible, something that looked a bit like poop, sewer and some dead animal note. They found a perfect mix but the invention remained in the drawer for several years.
Some time later the two colleagues, shortly before being fired from the company where they worked, poured a little spray near the microwave in the lunch break room. The effect was incredible and the two decided to repeat the joke periodically, driving the company crazy to find the problem in the pipes.
Once fired, the two decided to invest in this product, despite protests from family members. In the end the facts gave them reason: the product had a boom in orders, making them rich in a few years.