After hanging up my flying gloves, I became a ground school instructor, part of which was teaching ab-initio students about the seat they were going to use. I used a clip from a USAF training film showing the crew leaving an F4 as the aircraft pitched up uncontrollably after liftoff. One occupant went out as the aircraft still had an upward vector, the second went out higher but the aircraft had stopped climbing, the chute of the first ejectee opened at a greater height, despite ejecting at a lower height.
I last saw that film in 1985. But I recall the message. "Zoom and boom!"