The black swan theory is a metaphor that describes an event that comes as a surprise, has a major effect, and is often inappropriately rationalized after the fact with the benefit of hindsight. The theory was developed by Nassim Nicholas Taleb.

Deutsche Bank made a huge mistake
Germany’s biggest lender, Deutsche Bank, accidentally sent $6bn to a client after entering the wrong numbers (June 2014)… According to the report a junior member […]