a main theme of the movie is why Punks fight other people groups and why other people groups fight punks and the reasons they do so.
there is one scene involving a brutal beating of skinhead punks (nothing bloody or graphic shown, and is seen from a distance....but still rough)
several mosh pits during the concert scene
several fist fights done schoolyard style
a man threatens to kill 3 teenagers (he points a gun at them) because he thinks they are Satanists (they arent)
a drunk teenager kicks out the window of a cop car, then breaks free
Mark points a gun at Bob and meanly asks if he stole his pot (implying hes going to shoot him)
Shaun chases his mom through the house with a knife thinking she is Satan (he is high on acid)
at the beginning of the movie a character punches out a window and bleeds severely,
... and later on the hand is shown swollen and bloody after bandanges are removed
when sandy is having sex with the other boy SteveO proceeds to punch the boy several times in the face and is shown with bloody nose and lip
When Sandy and Steve-O are high on Acid...Steve-O somehow kills a snake and drips its blood into the river (more disturbing than violent)
...Steve-O then graphically describes how a group of people were killed by a cult leader in a forest.