If you were walking at the moment of switch-off, the thrust of your last footstep would send you in the direction of the ceiling (although the concept of 'ceiling' is somewhat academic, under the circumstances'.
My preference for artificial gravity would involve the spaceship spinning about an axis although I calculated a 100m ring-shape would have to spin at about 10rpm to generate 1g… which would make for gut-churning views out of the window. :-/ …and you can't switch it off instantly.