The head bashing scene is from the French movie "irreversible". I've said on here before that movie is the most disturbing movie I've ever seen. It's banned in some countries. If you think the fag bashing scene was bad, you should check out the 10 minute anal rape scene.
Definately a film to check out if you like to be made uncomfortable.
http://www.amazon.com/exec/obidos/tg...38362?v=glance