So, shocking news: Hit & Run is kind of a blast…go figure. Dax Shepard has, in fairness, made a movie before (2010’s Brother’s Justice, which sounds delightfully, suspiciously odd), so the man isn’t totally green in the realms of screenwriting and directing. All the same, permit me my surprised reaction. It’s late August, the film co-stars Tom Arnold, and Shepard remains best-known for his role in the MTV series Punk’d and Without a Paddle. Those aren’t exactly the kinds of credentials that inspire confidence in the jaded, but Shepard and co-director David Palmer use the aces hidden in their sleeves to great effect. Color me tasteless– Hit & Run works.…