Wells Fargo's revised policy takes back unpaid compensation awards in the event of misconduct, material error, failure to supervise or in the event the company or an individual executive's business group has a material downturn in financial performance or failure of risk management.

WSJ: Banks Bow to New York on Clawbacks

They happen often on the multi-million dollar scale, rather than the billion dollar scale of the flash crash, but they are the same class of event: The error trade.

FORBES: How To Regulate Robots With Fat Fingers

With the introduction of debit cards, money could be withdrawn from personal accounts instantaneously, leaving the individual little recourse in the event that the product or service was unsatisfactory or a billing error had occurred.

FORBES: Pension Consultant Shenanigans (September 4, 2004 )