I would love to work with any number of film directors, some of them no longer living, so I guess I would love to HAVE worked with them, in the capacity of screenwriter. I'd love to be on set to see/help someone really good bring my script to life.
I'd love to be Lanford Wilson. Can I be Lanford Wilson, please? Yeah, I know, Lanford Wilson is already being Lanford Wilson.
UPDATE 10/2011: Lanford Wilson, alas, is no longer being Lanford Wilson. However, no one else ever will be.