This seems appropriate today.....

"This is how the market is supposed to work, at least in theory: Stocks rise and fall based on the performance of their underlying companies.

“But in a vicious down market,” Cramer said, “the connection between a company and its stock can become gossamer thin. And often it can even be severed.”

You’ll see even the best names declining with the bad, regardless of any good news they may have reported. How could this happen? That’s exactly what investors need to know if their portfolios are going to survive these situations."

http://www.cnbc.com/id/38046217?__source=yahoo|headline|quote|text|&par=yahoo