This happened in Oct of 2018. Former F-16 Crew Chief here....I’ve yet to see an official mishap report.
To be an accident, so many things would have to go wrong. Minimally, the aircraft would have to be armed (which is somewhat rare at home station), the ground safe pins would have to be pulled, and the weight on wheels interlock would have to be overridden.
Then, the trigger would have to be pulled.
I'm thinking, since these are electricity-fired, static might serve instead of a trigger pull.