What do "Benny and Joon", "Mad Men" and 1976 (the year) have in common?     The VH-1 television movie "Two of Us", which featured two of the leads from those projects in a fictionalized version of what happened when John Lennon and Paul McCartney hung out one evening, and Lorne Michaels (on the then new "NBC's Saturday Night") made an offer to four guys - "The Beatles."