As the title says, what book/storyline would you recommend for someone who never read any comics in their life, who has zero knowledge and little intrest in getting into comics. As such, it has to be top notch writing and top notch art, something open and shut, something that requires no previous knowledge and that is not a hook into something else, that requires no further reading. A complete story. Something that, for the lack of a better expression, we can call "the complete experience!"
To get the ball started, my suggestions would be:
Batman - The Long Halloween - Jeph Loeb receives a lot of falk from fans, but, IMHO, his DC works are as accessible as it gets. This story (and Dark Victory, after it) read as a single mystery tale (though DV doesn't fugure here because i reads better if you HAVE read LH). Tim Sale's art is just another bonus.
Kingdom Come - Sure, it is a huge loveletter to the DCU, but it is not a book that really requires any previous reading. all the relevant characters and what you need to know is shown in the story. Sure, it may seem daunting, but there are fans of fantasy and fiction that never read comics, and this would be right up there alley. Plus, who doesn't love some Alex Ross art. And waid's script is great also.
Batman Year One _ Once again, Batman seems made for this kind of books, and YO introduces all you have to know about the Dark Knight. Miller and Mazzucchulli at the top of their games.
New Frontier - Once more, an open and shut tale, with all the relevant elements introduced in the book. Darwin Cooke really hits all the marks with this one.
So, what are your suggestions?
Peace