So Long and Thanks For All The Fish/YMMV


 * Tear Jerker: At the end of the book, Marvin, who (thanks to time travel) is 37 times older than the universe and has had all of his body parts replaced multiple times (except for the diodes on his left sides that have been paining him for all his existence),  .... But not before reading God's last message to his creation saying,   His  words? "I think.... I feel good about it."