In 1980 at an Air Show at the old Willow Grove NAS in Pennsylvania was sitting in a Navy S3 Viking Jet set as a ground display. They were allowing people to sit in the cockpit. A 7 year old boy was in one of the seats and somehow activated the multiple step and sequence ejection mechanism and was killed after being ejected and landing on the nearby tarmac.
Early 2000’s went to the Airshow at Randolph Field (North East San Antonio) and as We were walking from the parking lot to the Flight Line and Static Display the US Army Golden Knights Skydiving Team. We watched in horror as one of the Teams Main Chute snarled and so did the Backup Chute got tangled up in the Main Chute and came down in a grove of trees at the edge of the Base !!!
Tried to find details on the accident and never found anything.