Crazy French safety report: A defense contractor gets offered a joy ride in Rafale B, but fails to strap into seat and helmet properly, then mistakenly yanks ejection handle during negative-g event on take-off climb. Rafale, minus backseat, lands safely.
https://www.aerotime.aero/clement.charpentreau/24788-fighter-jet-crash-averted-by-defect-in-civil-ejection-incident?utm_source=newsletter&utm_medium=email

And the only reason the Rafale didn't crash was because there was a defect in the pilot's ejection seat. If someone in either seat pulls the handle, both seats are supposed to go.