There’s a scene in which Trillian can’t understand why Zaphod seems on the one hand quite bright and on the other appallingly dumb. That was a bit of self-portraiture. I sometimes strike myself as being quite a clever guy, and sometimes cannot imagine how I can be so slow-witted and stupid, so dull and brainless. I can’t understand why I should be able to write something which everybody thinks is terribly clever, and at the same time be personally so dumb. I think I’m schizophrenic.