Do horses deliberately try to kill people?

I've sometimes joked that a horse "tried to kill me" - but the truth is that in many years of riding and working with horses, some of which were previously abused, untrained, or whatever, I have only once witnessed a horse intentionally try to kill a human being.

In fact, domestic horses will often go out of their way to avoid harming humans. The horse that tried to kill somebody was euthanized - there was very definitely something pretty serious wrong with that animal.