But capital needs to be set aside more for unexpected losses than expected ones.

ECONOMIST: Basle bust-up

Suddenly you discover your bank is at much bigger risk than you thought and exposed to unexpected losses due to poor data.

FORBES: GoldenSource Helps Wall Street Manage Risk

As these loans turned bad and losses mounted, it became clear that banks had set aside too little capital to protect themselves against unexpected losses.

ECONOMIST: Global economic imbalances

As for oil and gas, it too gets some uncommon tax breaks and benefits not given to other industries: Marketing efforts by the Overseas Private Investment Corp. and national insurance that protect against unexpected losses, like revolutions.

FORBES: Obama and Romney Drill for Energy Answers

The Lakers and their two MVP candidates - Shaquille O'Neal and Kobe Bryant - are on a roll and have moved into the sixth spot ahead of my own Utah Jazz after two unexpected losses on the road.

BBC: NBA enters crucial stage

Notwithstanding these positive factors, the unexpected losses and the increased pressure on their balance sheets have prompted banks to become protective of their liquidity and balance sheet capacity and, thus, to become less willing to provide funding to other market participants, including other banks.

NPR: Economic Swoon to Continue, Bernanke Says

The causes of action related to alleged unexpected margin calls that resulted in losses in two hedge funds.

FORBES: Merrill Lynch Professional Clearing Hit With $64 Million FINRA Arbitration Award

While Citi was hardly alone in that kind of misery, the investment banking losses took a more unexpected cut to its bottom line.

FORBES: Connect

An unexpected leap in interest rates left several well-known clients facing huge losses on their investments.

ECONOMIST: Orange County