I have seen injured people lash out at doctors on hospital documentaries.
Yes, it happens. I stopped wearing my lanyard because a patient grabbed it and starting choking me. Lucky for me someone else was in the room to help.
As far as "snapping" goes, humans are good at it. Especially when they feel threatened.
"As far as "snapping" goes, humans are good at it. Especially when they feel threatened."
I agree. In fact, I think it's safe to say the only animals that "snap" ARE humans. Animals do a pretty good job showing what they like and dislike, if you know how to read them. People carry things with them until they get unbearable. Dogs seem to be pretty cause-and-effect kind of creatures, and they definitely don't have any natural reason to hide their "emotions" until the boiling point.
I read somewhere recently that every year people are bitten more often by other people than by dogs.