#1: 5-4-3-2-1 Erk! Roar! Top time? 10.035 seconds! #2: You're going to fast! Watch out for this curve....erk! Phew! That was close. #3: What is that! erk! Thump thump.....
Definition of accidental. 1a : occurring unexpectedly or by chance an accidental discovery Their meeting was purely accidental.b : happening without intent or through carelessness and often with unfortunate results The death was ruled accidental.
1 A very large and destructive wave, generally caused by a tremendous disturbance in the ocean, such as an undersea earthquake or volcanic eruption. ( 2 figuratively) A large and generally unstoppable surge.  2009, John Bernard Kelly, An Accidental Atheist: A Memoir, Aquinine books (ISBN 9780980709711), page 306.