"Pain & Gain" is a comedy, folks. A Michael Bay comedy. And believe it or not, it's funny, sometimes very funny. Mark Wahlberg stars as Daniel Lugo, a Miami personal trainer with dollar signs in his eyes who puts together a ragtag crew of dim-bulb criminals (Dwayne Johnson as an ex-con who found Jesus in stir and, from "Night Catches Us," Anthony Mackie as a juicehead who's sacrificed his family jewels at the altar of anabolic steroids) to kidnap the ultimate wrong guy, one of Lugo's clients, a seemingly unbreakable Colombian deli owner with the great movie name of Victor Kershaw (Tony Shalhoub).