If on the other hand he went to pay his respects to The Door and it wasn't there . . . what then? The answer, of course, was very simple. He had a whole board of circuits for dealing with exactly this problem, in fact this was the very heart of his function. He would continue to believe in it whatever the facts turned out to be, what else was the meaning of Belief? The Door would still be there, even if the Door was not.
Douglas AdamsCome on,โ he droned, โIโve been ordered to take you down to the bridge. Here I am, brain the size of a planet and they ask me to take you down to the bridge. Call that job satisfaction? โCos I donโt.โ He turned and walked back to the hated door. โEr, excuse me,โ said Ford following after him, โwhich government owns this ship?โ Marvin ignored him. โYou watch this door,โ he muttered, โitโs about to open again. I can tell by the intolerable air of smugness it suddenly generates.
Douglas Adams