In multiple Hollywood movies and TV shows I've seen scenes where a plane enters turbulences and for a moment the people in the plane seem to move upwards relative to the plane.
As far as I know, as long as the plane doesn't accelerate downward with more than gravity's acceleration, the people on the plane should only feel less of their weight but they shouldn't jump up and hit the ceiling.
I know that certain planes like fighter jets can reach such negative G values, but I'm talking about passenger planes.
Now I'm wondering if it's really possible that for an instant a plane would accelerate downward with more than the acceleration of gravity due to the turbulences maybe pushing it down? Or are scenes where people hit the ceiling of the plane just pure Hollywood fantasy?
One example of such a scene is here at 02:00 https://www.youtube.com/watch?v=xuYbd15n5t8