Picture this: three friends are taking in the 1998 comedy Free Enterprise. We represent about half the audience in the theater. The film, which deals with a pair of lifelong science fiction geeks facing their 30th birthdays, has a dream sequence that begins with a very specific, recognizable throbbing noise. The three friends collapse in hysterical laughter while the other half of the audience sits in confused, stony silence. The difference between the two parties is that the three who are laughing have seen Logan’s Run, probably more than once.