Have you seen the new Da Vinci Code movie or read the book? This publication has created a lot of controversy since it was first published, and to paraphrase and old quote, 'it has a lot of people's panties in a tight wad'. Personally I found the movie an enjoyable piece of fiction, but highly inaccurate from a facts point of view.
There are real facts in the movie, but they're tightly intertwined with a lot of fiction. So it hard to know where one begins and the other ends. Personally, I would not go around quoting facts from the movie.
HowStuffWorks.com did a great article on some of the many problems found with the movie facts vs. reality. Here is an except from the article: "Since its 2003 publication, "The Da Vinci Code" has caused quite a stir. Since its debut to glowing reviews, it has sold more than 40 million copies in at least 44 languages [ref]. In addition to being a bestseller, it's sparked a lot of controversy. It's a work of fiction, but it presents itself as based in fact, and many critics have raised questions about whether those facts are accurate."