Yeah, my first accidental spin is burned in my memory. I was demonstrating slow flight and stalls in my Chief to a female coworker (who was also a new pilot) and suddenly it was in a spin. Fortunately I had started the stall practice at 3500 agl.
I looked at her and she had no clue. Then I looked at the control yoke and my hand was pulling the yoke hard into my chest.
After 5 seconds I decided to release the back pressure. Previously, I had purposely hired a spin qualified instructor and did two spin recoveries. My regular instructor in the Cessna 150 never did any spins. But I knew the Chief was spin prone so I got spin instruction even though not required by FAA.