I have a short and hopefully amusing story for you.
A couple of years ago, the subway system here in Boston experimented with a new kind of advertising. It affixed a long sequence of images to a certain stretch of tunnel wall, and shone a strobe light on it. Commuters thus saw a charmingly atavistic moving-picture display as the train trundled past.
The experiment ended after a few months, and the subway stopped installing new advertisements. The last ad for it was for the film "Coraline", put into place 18 months or more ago. The MBTA apparently decided that it was cheaper to just leave the installation in-place rather than tear it down.
And so, Coraline and her friends have been peeping into the Red Line between Harvard and Central squares all this time, ending with the message "In theaters February 2009". The ad has grown increasingly dim with all the accumulated subway-dust, but it remains quite visible, and even attention-grabbing.
A friend [radiotelescope] suggested that Neil Gaiman might enjoy knowledge that the Boston Underground is haunted by a girl-ghost, dim and flickering but still animated and lively, to whom he is related. So, there you have it.