If you've sat through a good part of the movie already and you don't like it, and there is no indication it will get any better, why can't you just walk out?
Wow! Your post is alarming and unbelievably simple at the same time. Do you think that committing suicide is that simple? And I would disagree with what you wrote. Most of those who commit suicide are in their teens or 20s. They have't "sat through a good part of the movie". 75% of their life is incomplete. So how can they decipher that it is not going to get any better?