By the world-renowned expert on sucking the world dry, Bernard Madoff.
Pyramid schemes: the ultimate get-rich-quick scheme for those who want to get rich-very-slowly-and-then-lose-everything-in-a-bankruptcy-court.
Recruit a bunch of gullible suckers and promise them a 20% return on their investment. Pay off the early adopters with someone else's money, and use the rest to fund your own lifestyle of excess.
Example: Bernie's Ponzi Scheme Inc. - 20% return, guaranteed! (Just don't ask the investors what happened to their money)
Learn more about Bernie's Ponzi Scheme Inc.