How to Stop An Argument and Fight Less Going Forward

People frequently ask me about how to stop an argument. When they do, I’d love to give them a fool-proof way to get it done. I wish it were as simple as saying one or two words, instantly turning two people amidst taking each other’s heads off into docile, compliant, happy people free to go about their business as if nothing happened.
Unfortunately, nothing short of physical distance stops an argument. I know this, because I have spent much of my early life arguing. I have never been able to stop arguing once I get started.