Sacha Baron Cohen's funniest alter-ego, Borat Sagdiyev, the roving reporter from Kazakhstan, has hit the big screens in Borat: Cultural Learnings of America for Make Benefit Glorious Nation of Kazakhstan. The title tells you enough. It will be silly, childish and quite offensive in parts, but that's comedy, right? Reviews suggest Borat has a similar problem to Ali G in adapting to a feature-length film, but if you haven't seen it yet you're missing out on one of the biggest box office hits this year.