Hollywood —- When Etan Cohen was working on the character of Kirk Lazarus, an actor played by Robert Downey Jr. in the comedy "Tropic Thunder," he asked himself: What is the most offensive thing an actor can do to get a part?

The answer was to have Lazarus, an Australian Method actor, try to become a black American character by undergoing a pigment procedure and then speaking street slang around the clock. "It seemed about the vilest thing you could do," Cohen said, laughing.

Cohen, a polite young man in a sport coat and yarmulke, didn't look much like one of the creative forces behind the summer's bloodiest, raunchiest and most politically incorrect comedy. As waiters served brunch in the posh Beverly Hills Four Seasons restaurant, the clear-eyed, Harvard-educated screenwriter tossed out Latin phrases like "reductio ad absurdum" (proving a proposition by showing its opposite to be false) alongside the dirtier words that fill the low-concept, high-profile film he co-wrote with Ben Stiller (who also directs and stars) and Justin Theroux.

He's aware that it's not always clear in parodies what the audience is laughing at. Early blogging about the film indicated some people won't find the Lazarus character funny at all. "It's important to say that what's being parodied is certainly not any actual black human being but the ideas in the actor's mind of what an African-American would be," Cohen said. Then he added, "Which might be a fine line for people."

That's the sort of line, however, Cohen aspires to walk. A fan of films such as "The 40-Year-Old Virgin" and mentored by Mike Judge (on "Beavis and Butt-head," "King of the Hill" and "Idiocracy"), Cohen can be viewed as following filmmaker Judd Apatow into the R-rated comedy genre along with actor-writer Seth Rogen. Cohen and Rogen each have appeared on Variety's "screenwriters to watch" list.

Cohen was brought in to help write "Tropic Thunder" six years ago after Stiller and Theroux had been kicking around the concept for several years. The film follows a group of actors stranded in Vietnam while making a war movie and who inadvertently stumble into actual paramilitary violence when they run into drug traffickers. The film is "hard funny," according to Jack Black, who stars in the ensemble film with Stiller, Downey, Nick Nolte and Tom Cruise, among others.

"It's a movie that was not afraid to go for it in every possible way," Cohen said with pride.

He said he felt a particular sense of victory when reading Internet chats in which people who hadn't seen the film were objecting to it. In the movie, Brandon T. Jackson, as rapper-turned-actor Alpa Chino, complains to Lazarus that there was only one good role for a black actor and they gave it to the Aussie. On the Web, "People were saying there was one good role for an African-American actor and they gave it to Robert Downey Jr. They were saying with a straight face exactly what we were saying in the movie. That felt great."

Despite his own scripted contributions, Cohen said that perhaps his favorite part, indeed the one that's generating the most buzz among critics, is at the end of the movie when Tom Cruise, playing a bilious, profane, overweight and balding studio head, engages in a solo hip-hop dance. "That was Tom's idea," Cohen said. "That's why the guy's a movie star. It's an amazing rediscovery of how funny he is."

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