At 40, Franz Kafka (1883-1924), who never married and had no children, was walking through a park one day in Berlin when he met a girl who was crying because she had lost her favorite doll. She and Kafka searched for the doll unsuccessfully.
Kafka told her to meet him there the next day and they would come back to look for her.
The next day, when they had not yet found the doll, Kafka gave the girl a letter “written” by the doll saying “please don’t cry. I took a trip to see the world. I will write to you about my adventures.”