The OTC-traded common shares of Fannie Mae are up over 750% over the past 12 months but have plummeted during the past several days of trading. Is this a pure speculation play, or is there actually opportunity for Foolish investors?

In this video, Motley Fool financial analysts Matt Koppenheffer and David Hanson answer with a resounding "No!" Matt and David remind investors what these shares are entitled to and why investing in them may cause investors to lose sleep at night.