Viggo's ad-lib

http://www.latimes.com/business/la-et-strike1dec01,1,1685506.story?track=rss

From LA times.com, a reference to Viggo's ad-libbing during APPLOOSA,
"Everett Hitch and Virgil Cole had been riding all day, chasing bad guys across the chaparral in the western "Appaloosa." As actors Viggo Mortensen (who was playing Hitch) and Ed Harris (Cole) sat around a campfire filming a scene on the Galisteo, N.M., set, Mortensen improvised a line. "I'm about ready," he grumbled, "to make a pair of chaps out of that Godforsaken mule."

It was the kind of ad-libbing that happens on almost any movie and, given Mortensen's cranky but erudite "Appaloosa" character, a perfectly fitting riff. But was the actor being a quick-on-his-feet movie star or a strike breaker?

As it happens, Mortensen's new dialogue was kosher, but it illustrated the gray area affecting scores of movies in production. If Mortensen had been a Writers Guild of America member, as many actors including costar Harris are, and if he had typed up his new line, he might well have been headed to the WGA cooler."