Broken glass bottles and stuff!

2 days ago, in a dream:

I was waiting for my friend, after school. We were gonna walk home as usual. The surroundings weren't the usual though. While he was getting his backpack, I went into some room from the outside of the building. There were many people, not doing anything special, but when I said something... just something, I don't remember, the guy in the back row, started yelling something, over and over again, insanely... like SOMETHING violent against me, I honestly can't remember what it was. But he wanted the others to hurt or... CATCH me in some way, for what I had said. I know who the guy is, and he's never been violent, he's just kind of badass! So I remember saying something like "hah what are you honestly gonna do to me?:)" in a sarcastic-doubting way, finding it silly or ridiculous to beat me up or something.
The next thing I remember was crossing the road outside, without my friend, and then I was sitting down on a small bench or just a randomly placed unclear seat somewhere near. The guy who had been shouting like a maniac broke glass bottles on my head. Many times! And he poked me with the remainings afterwards, making wounds and all kinds of. I then later went home, all beaten up, and there me and some friends were planning to play instruments or something. I can only remember that I half expected them to feel a bit sorry for me, but that's pretty much what I can remember.