In the following video, Fool contributor Matt Thalman discusses a few actions investors can take when their ithesis for owning a stock has fallen apart. He uses Zynga's (NASDAQ:ZNGA) recent announcement to no longer pursue online gambling as an example. If you'd purchased Zynga hoping that the company would hit it big with online gambling, what should you do? Check out the video to see what your options may be.

Fool contributor Matt Thalman and The Motley Fool have no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.