Most Disturbing Movie Scenes

[Punishment1o1]

So I was perusing the iMDB message boards earliers and one of them was on topic about some of the most disturbing movie scenes. Whether they be racial violence, violence againsts women or from a horror movie. So that makes me ask, what are some of most disturbing scenes from movies you've seen? Some of mine are:

American History X: Derek making the guy put his teeth on the sidewalk and then stomping his head in.

Alien: Chest-burster scene. 'Nuff said.

The Texas Chainsaw Massacre: The Beginning: Leatherface cutting off Eric's face and wearing it himself as Eric's girlfriend watches on in horror.

I'm sure I'll think of more or remember some when other reply, but that's what I got for now.