How many times have you seen Blade Runner? In the late 80s I would have confidently answered in the double digits. A quarter-century later I'd rather account for the number of times I've stepped in the same river. There are so many versions, and so many different media in which to view these versions, and I'm such a wash at math that I don't think I could construct the necessary algorithm to provide an accurate answer.
Jonathan Rosenbaum tackles the Blade Runner issue, along with several others that hadn't occurred to me, in his quest to help the home-style critics and film historians among us, here.