David

“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.”
― Douglas Adams, The Ultimate Hitchhiker’s Guide to the Galaxy

“Sorry, did I say something wrong?" said Marvin, dragging himself on regardless. "Pardon me for breathing, which I never do anyway so I don't know why I bother to say it, oh God I'm so depressed. Here's another one of those self-satisfied doors. Life! Don't talk to me about life.”
― Douglas Adams, The Hitchhiker’s Guide to the Galaxy

“Marvin trudged on down the corridor, still moaning. "...and then of course I've got this terrible pain in all the diodes down my left hand side..."
"No?" said Arthur grimly as he walked along beside him. "Really?"
"Oh yes," said Marvin, "I mean I've asked for them to be replaced but no one ever listens."
"I can imagine.”
― Douglas Adams, The Hitchhiker’s Guide to the Galaxy

“Don't blame you," said Marvin and counted five hundred and ninety-seven thousand million sheep before falling asleep again a second later.”
― Douglas Adams, The Hitchhiker’s Guide to the Galaxy