Reminds me of my own personal incident. I was also aound 19 at that time, was driving an MT sedan. I parked my car outside of my school building, the parking lot was inclined. Went up the school and after 10 minutes went back down. Surprise suprise my car was at the bottom of the inclined lot. stopped bythe gutter. After that incident i got so paranoid that i routinely check the car to the point of going back to the parking lot if i cant remember to an absolute certainty that i shifted it to first gear and engaged the handbreak.

It was an eye opener for me, not only was i concerned i could damage mycar but also what if i run down soembody and got hurt, that parking lot was so busy with student traffic. Im just thankfull i learned my lesson the easy way!!