So you'll need some context to understand this situation. My friend, now referred to as Jess to hide her identity, is very anti-violence. In the two years I've known her the worst she's done is fake punch one kid when we ALL wanted to punch. Hard.
So now for the story. A senior at my high school in my math class was going on and on and ON about how he was going to find a freshman and (to summarize it) seduce her. She then looked straight at him for ten seconds with a deathglare. She finished this by saying, "If you don't shut up right now I will beat the shit out of you. If you talk again this class I will beat even more shit out of you."