The only movie I walked out of for moral reasons was after I was done with 'the truth'.
It was '8mm' I think (or another movie like it around that time).... about people being filmed while being abused in more ways than one.
I was filled with rage that this passed as entertainment and I stood up and yelled 'This is fucking bullshit!' and stormed out of the theatre leaving my friends there. No lie.
They came and picked me up after the movie at the bar across the parking lot. I think I was drinking before I went to that movie, which explains my lack of impulse control, lol.
Yeah, I don't drink anymore. Anyway, that's my walk out story. Enjoy.