https://www.bbc.co.uk/news/stories-45117163This is a serious subject, and the original thread title was quite flippant.
This seems to be in extremis, so it's not a common thing, but really, I'd want to know quite how to do it. I'm told it's severing the carotid artery? It's really about becoming a doctor.
If you were knocked out someone could do it that way.
Personally, I think it's about testing the law.