On Thursday morning of last week, I spoke to actress Olivia Williams about her participation in Roman Polanski's film The Ghost Writer. Although I would have been happy to digress into a lengthy discussion on the finer points ofher performance as Miss Cross in Rushmore, this writer's favorite film of all time, we mostly spoke about the new film, Polanski and her career in general. Towards the end of our time, however, I did take a moment to ask about her cameo in X-Men: The Last Stand, which she explained she did as a favor for director Brett Ratner.

"Brett Ratner was a big Rushmore fan growing up," she explained.

"So he said listen, there's this opening scene and you won't even be credited in X-Men, but I'm a huge Rushmore fan and I'd love you to do it." Williams appeared in one scene as Moira McTaggert, a brainy scientist who helped the X-Men and other mutants in the comic book series. She revealed that although Ratner indicated it would be a small role, others reassured her that she might step into superhero tights when and if another installment was greenlit.

"Of course, your agents say, if there's an X-Men 4, there's going to be a huge Moira McTaggert part, which you'll be in," she said with a laugh. "I'd just had a baby, it was a weekend on Vancouver Island, and a scene with Patrick Stewart even though he was unconscious, so I said yes. It sounded like fun, and actually Brett Ratner you know, good things always come from Rushmore fans." Indeed.