So many lessons to be learned from these experiences.
Someone referenced the 1968 Atlantique crash at Farnborough earlier in the thread and sadly for those airmen their moment was tragically their last. For anyone not familiar:
Following a last minute re-assignment of the PIC, which is rarely a good thing. The aircraft was performing a low level display which included a single engine (feathered) pass with the port engine shut down. The gear was left down (which was unbriefed) and the a/c entered a low level 25 degree bank to starboard at which time the port prop was unfeathered. The aircraft then gently rolled to port at which time the roll was seen to rapidly increase to 60 degrees and the aircraft impacted some hangars. All 5 crew were lost plus one RAE technician on the ground (and a dog, rarely mentioned).
One little known fact is that the French crew had earlier been in the RAE Library where they spent some time chatting up the young ladies who worked there, convincing them to come up on the display flight with them the next day. They were saved by their boss who told them they were there to work, not go on joy rides.