A good example of "bad things" happening would be Quantas Flight 72 [1], an event in 2008 in which an Airbus A320 made a series of uncommanded movements, becaus

A good example of "bad things" happening would be Quantas Flight 72 [1], an event in 2008 in which an Airbus A320 made a series of uncommanded movements, because of a particularly strange design bug in one of its flight computers, the air reference data unit one. Despite being repeated in triplicate, a timing bug occasionally resulted in pitch down movements being voted on as the 'correct' thing to do. Unlike MCAS in the 737, these were _not_ repeated and ultimately the pilots were able to fly in 'alternate law', and land safely. Subsequent investigations believe that a cosmic ray induced bit flip is the most likely explanation. [1] https://en.wikipedia.org/wiki/Qantas_Flight_72 https://en.wikipedia.org/wiki/Qantas_Flight_72