Cramer: Four Reasons to Be Skittish

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People ask me why I am so often freaked out about what is happening daily in this market. Let me give you four reasons: Sheldon Adelson, Sumner Redstone, Howard Lester and Aubrey McClendon.

All four of these gentlemen got overextended and bought too much of their own stock or the stock of another company and got margined out.

These are great American businessmen. They are much smarter than I am -- much smarter than almost any people in business -- and they completely and utterly screwed up. You cannot possibly say that they did anything else. ...