“Even a manically depressed robot is better to talk to than nobody.”

“We already have the Wooden Pillar, the Steel Pillar and the Plastic Pillar. In a moment we will have the Golden Bail....'No, you won't.'We will,' stated the robot simply.No, you won't. It makes my ship work.'In a moment,' repeated the robot patiently, 'we will have the Golden Bail....'You will not,' said Zaphod.And then we must go,' said the robot, in all seriousness, 'to a party.'Oh,' said Zaphod, startled, 'can I come?'No,' said the robot, 'we are going to shoot you.'Oh, yeah?' said Zaphod, waggling his gun.Yes,' said the robot, and they shot him.Zaphod was so surprised that they had to shoot him again before he fell down. (85-86)”

“The Encyclopedia Galactica defines a robot as a mechanical apparatus designed to do the work of a man. The marketing division of the Sirius Cybernetics Corporation defines a robot as "Your Plastic Pal Who's Fun to Be With. The Hitchhiker's Guide to the Galaxy defines the marketing devision of the Sirius Cybernetic Corporation as "a bunch of mindless jerks who'll be the first against the wall when the revolution comes,”

“Zaphod Beeblebrox, adventurer, ex-hippie, good-timer (crook? quite possibly), manic self-publicist, terribly bad at personal relationships, often thought to be completely out to lunch.”

“I'm so great even I get tongue-tied talking to myself.”

“Well, sir, I think it's just as well that they are being phased out of the war effort, and that we are now going to detonate the supernova bomb. In the very short time since we were released from the time envelope-''Get to the point''The robots aren't enjoying it, sir.''what''The war sir, it seems to be getting them down there's a certain world-weariness.''Well, that's all right, they're meant to be helping to destroy it.''yes, well they're finding it difficult, sir. They are afflicted with a certain lassitude. They're just finding it hard to get behind the job. They lack oomph.''What are you trying to say?''Well, I think they're very depressed about something, sir.''What on Krikkit are you talking about?''Well, in a few skirmishes they've recently, it seems that they go into battle, raise their weapons to fire and suddenly think, why bother? What, cosmically speaking, is it all about? And they just seem to get a little tired and a little grim.''And then what do they do?''Er, quadratic equations mostly, sir. Fiendishly difficult ones by all accounts. And then they sulk.''Sulk?''Yes, sir.''Whoever heard of a robot sulking?''I don't know, sir.”

“Simple. I got very bored and depressed, so I went and plugged myself in to its external computer feed. I talked to the computer at great length and explained my view of the Universe to it," said Marvin."And what happened?" pressed Ford."It committed suicide," said Marvin and stalked off back to the Heart of Gold.”