freak accident

plural freak accidents

1. An incident, especially one that is harmful, occurring under highly unusual and unlikely circumstances.

   A freak accident during basic training left his son crushed beneath the body of an overturned supply truck.

   1996, George W. Proctor, Before Honor, page 39

   2 more examples

   For the Union Carbide Company, the chemical industry, and other businesses, Bhopal is an unfortunate chain of coincidences, a freak accident, a regrettable loss of lives.

   1990, Gary Cohen, John O'Connor, Barry Commoner, Fighting Toxics: A Manual for Protecting Your Family, Community, and Workplace, page 135

   Even though I know what happened with my brother was a freak accident, I wish I had made choices that would have led to a different outcome.

   2006, Hill Harper, Letters to a Young Brother: Manifest Your Destiny, page 100