[Movie] Most disturbing movie

I'll go with Sympathy for Lady Vengeance. There are several shocking scenes but there is one particular scence where:

Spoiler:

A woman shows a film to some parents whose kids where kidnap by some psycho. In the scene is shown how the man kills a child. It's not totally seen, but the impression is sooooo awful that made me close my eyes for a second. It's kinda Psycho's shower scene, where it is not shown any stab to the woman, but it's so well filmed that you can't stand it

Jam it back in, in the dark.