It's happened with the hydraulics off - stick motored to full deflection and stayed there for 30 second
Unfortunately turning off the hydraulics is a flawed assumption as a few people have found out.
I note that a few condone the action on this thread.
Take a look at the "irreversible" function and how it works on some common models.
You may find that you are better off with HYD ON and friction ON.
Many years ago company policy for leaving the aircraft unattended was to NOT turn HYD OFF as they had found out the
hard way on more than one occasion!
Bull$hit and assumption will only get you so far!