Some sibling bonds are inseparable. But that of Bob (Matt Damon) and Walt Tenor (Greg Kinnear) is especially strong: the two are conjoined twins, joined at the torso, sharing both a liver and a life.

If you believe, as I do, that America is joined at the hip to the rest of the world but often in denial about it, then this cheerful comedy from the politically incorrect Farrelly brothers (There’s ...