If this works, expect every city across the country to give it a whirl.

Baltimore is one of the most dangerous cities in the U.S. Sure, it doesn't make the Top 25 worldwide, but in America, it's No. 1, baby. In 2016, the city of 621,849 had 318 murders — that's 51.1 per 100,000 people, tops on the list.

Not too shabby, Charm City!

And they're on record pace again, with 188 murders so far this year.

But neighborhood leaders have a few tricks up their sleeves to trim the murder rate. One of them is absolutely brilliant: Just ask people to stop killing other people, for, you know, like, one weekend. See how that goes.

The leader of the movement is Errika Bridgeford, a 44-year-old mother who calls for a 72-hour truce, reports the Baltimore Sun.

Organizers aim to stop the shooting from Friday, Aug. 4, through Sunday, Aug. 6, with a unified and blunt message: “Nobody kill anybody.” Their message has been printed on T-shirts and flyers. They designed a website and held community meetings. More than 1,600 people visited their Facebook page. The grass-roots campaign has swelled since it began in May. “I’ve seen the momentum build over the past several weeks,” said T.J. Smith, spokesman for Baltimore police. “We are all in this together, and we’re 1,000 percent supportive of the efforts.”

So far, the organizers say some 600 people have joined the campaign (leaving 621,249 still free to commit a few murders that weekend).

It is, of course, a noble cause.

A professional mediator, neighborhood volunteer and part-time Uber driver — “Everyone who gets in my car leaves with a flyer and a speech” — Bridgeford says her younger brother was gunned down a decade ago in Southwest Baltimore. His killer was never caught. Next month’s ceasefire would prove successful if it deters a single shooting, she said. And she figures the movement has already saved a life somewhere. “Somebody was plotting on this weekend,” she said. “Now they’re not going to do it because of a rumbling in their soul.”

But we're guessing the murder rate will be completely unchanged by the call for a voluntary cease fire.

Maybe the neighborhood leaders should go to Plan B: Hand out paintball guns to all the young hoodlums with the directive that if you get painted, you have give up your life of crime and go get a real job.

Hey, it could work. If not, maybe pass out knives? Wait, better, pool noodles. Give that a try.