One of the worst and most unsuitable investments we have ever come across is the reverse convertible. Like the Devil himself, they have so many names, and are not easy to recognize on brokerage statements. UBS calls them “Yield Optimization Securities.” They are also known as “revertibles,” “revertible notes,” “reverse exchangeable securities,” and so on. And they are devilishly popular ? brokerage firms sell a lot of them to elderly, retired, and on-the-brink of retired investors who need a way to generate sufficient income to live on without undue risk to their principal. The problem is that these investments are essentially put option contracts that do jeopardize principal, and brokers do not explain that critical fact.