The Importance of Being Marvin
Marvin found himself trudging over to the window, sadly dragging his robotic limbs of metal and twisted wire. Spaceships would always be an adventurous, though often traumatic method of transportation. The thrill of intergalactic travel took a long time to wear off. It was a novelty that lasted many years for people who weren't Marvin.
You see, Marvin was never the life of the party, never the happiest kid in the sandbox. Perhaps his severely advanced intelligence made up for the endorphins he so obviously lacked. Maybe all he needed was the dark abyss of space to be alone in and philosophise about. Whatever the case, Marvin was an utter drag to be around.
"Are there any... space parties we could go to?" Enquired the very human and very uninformed Arthur Dent.
"Why go to a party when we have the extremely exciting Marvin?" Replied Zaphod Beeblebrox, who on the hand wasn't very human at all. His tone of sarcasm was recessive against his cheery disposition, but present nonetheless.
Fellow space traveller, Ford Prefect was quick to suggest that they should stick around the ship—perhaps have a game of Monopoly or two—but their plans didn't necessarily need to involve Marvin, who probably had something depressing already planned for the evening anyway.
Marvin sighed a computerized sigh and slowly extracted himself from the room. His signature slumping was present all the way. It was only in his absence that the remaining lifeforms spoke.
"I think we need to do something to cheer up Marvin," suggested Zaphod. "He seems even more suicidal than usual."
"He's a robot," deduced Arthur rather wittingly. "He isn't even supposed to have emotions, let alone the personality of a teenager," he protested. It seemed completely absurd to him that a robot could have feelings, and he was rather frightened at the thought that his refrigerator might suffer from schizophrenia.
In the end they settled for a friendly game of Trivial Pursuit, which of course Marvin won by a landslide. "I'm depressed, I'm not an idiot," noted Marvin in his monotone voice.
"It's just a shame you can't use that intelligence to fix the toaster," Ford pointed out.
"The toaster isn't broken," stated Marvin. "You've been trying to toast bread in the dishwasher."
"...that answers a lot of my questions."