i was really young when i saw it. i remember a couple of scenes. 80’s or early 90’s. might be all separate movies.

1. college fraternity students have a task to throw bricks that are tied to their penises out of the window. the rope should be long enough to hit the ground.
2. probably at the beginning of a film. art (maybe not) student is showing his animation film in the class. it has vivid and violent imagery, maybe wolves, bird or a bat being eaten. intense stuff. might be the opening credits that transition into his animation film.
3. a group of students (friends) find guns in a truck and decide to fight crime or trying to get revenge on a gang. the dog is killed at some point.
4. there is a black van with a white skull on its side. or just a black van with a window. the criminals ride around and kill people.

it’s been bothering me for years.