V. Cerf set up a dialogue between two of the most famous early chatbots, PARRY encounters the DOCTOR (RFC439) The DOCTOR is the therapist script for Weizenbaum’s ELIZA that is how people usually encounter of ELIZA. PARRY was developed by Kenneth Colby and acts like a paranoid schizophrenic. Putting them into dialogue therefore makes a kind of sense and the result is amusing.
It is also interesting that this is a RFC (Request For Comments), a genre normally reserved for Internet technical documents.