I try not to know too much in advance about films I watch. When I saw a DVD for “Riders of Justice” (2021) with Mads Mikkelsen’s big, bearded mean-mug on the box, I assumed it was a sloppy, meathead, biker action flick. I mean, his name is MADS. Well, Mads supplies plenty of gunfire, but I was the one walking into an ambush – subtitles (they’re speaking Dansk), wacky professors, deep conversations about math, death and fairness (both separately and together), and some truly dark humor. And it’s a Christmas movie! It’s no coincidence pleasant surprises are often the greatest joys.