The year was 1975…A.D. Michael Palin, Terry Jones, Terry Gilliam and Graham Chapman found themselves appearing live on a public television pledge show (“Festival ’75!!!!”–try and get the theme music out of your head afterwards) answering questions from fans in the studio audience. Only the first thirteen or fourteen minutes of the interview are extant, but this fragment hasn’t been seen since the thing originally aired.
Found via Screenhead.