What is the ruling on saying "Bismillah" (in the name of God) before eating while watching forbidden movies?

You must stop watching forbidden films because they involve disobeying Allah's command to lower the gaze, and because of the severe harm that results from them. As for saying 'Bismillah' over food or other things while watching these films, there is no sin in it, as there is no connection between eating and saying 'Bismillah', and watching what is impermissible.