We tend to ask what are the best, top, most .... So, I thought, why not start a thread on what are the worse... So: What do you think are the worst types of stocks, companies, funds, bonds, real-estate (or whatever other investment you can think of) someone can invest in? What are the worse types of start-ups someone to invest in? What types of investment look really risky or bad in the beginning but tend to turn really good in the end?