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.

Taiwans Military Chief dies in a helicopter crash. Coincidence? I think not!
Taiwan’s chief of general staff, Shen Yi-ming, and seven high-level defense officials have died in a helicopter crash Thursday morning in a mountainous region south […]