True story from my story book:

Once upon a time had an instructor come see me with concerns about his student. Short version, his student was pushing him for a checkride sign off and he didn’t feel he was ready.
Asked me to fly with him and give my verdict. So I said ok, if he flies within Private Pilot PTS will you sign him off?
Instructor says yes.
Flight scheduled and I briefed the student extensively on how and what and where and when. Went through the PTS with him and he and I agreed that if he flew within the PTS he would get his sign off and if he did not he would agree to further training required.

Off we go in a C172SP.
He did ok, nothing spectacular but ok.
Power off stall was decent and I asked him for a Power on or departure stall.
When he selected full flap I had a suspicion this was going to get interesting. We were at 4500’ and as he went full power he didn’t add enough right rudder.
So he keeps pulling back as I see the sky sliding by in what is now a shallow bank left climbing turn.
Stall horn, little airframe tremor and we snaprolled to the right over the high wing.
As we went inverted I saw the panic in his eyes.
Not fear.....panic.
Pure unadulterated panic of death in his eyes.
I recovered and once wings level I asked him what he thought happened.
He said I don’t know.
I asked him if he wanted to continue the flight and he said no.
I flew us back in silence.
He settled his account and left to never come back.
His instructor asked what happened.
I said he realized he would have died today.