I imagine someone took a Western short story, adapted it for the 1970s as a one-act play called “Shootout at the IRA Corral,” and mailed it to Martin Scorsese with a note saying, “Betcha can’t make a movie like Tarantino!” That’s how I imagine Scorsese ended up executive producing “Free Fire,” which made the 2016 international festival circuit and then bombed at the 2017 U.S. box office. I don’t care. It’s funny. It’s got Irish guys, a cute girl, a bunch of Buscemi-like weasels running around and a dude that looks like he just stepped off the set of “Argo.”