A little girl who was asked to write an essay on "birth." She went home and asked her mother how she had been born. Her mother, who was busy at the time, said 'the stork brought you darling, and left you on the doorstep.' 

Continuing her research she asked her dad how he'd been born. Being in the middle of something, her father similarly deflected the question by saying, 'I was found at the bottom of the garden. The fairies brought me.' 

Then the girl went and asked her grandmother how she had arrived. 'I was picked from a gooseberry bush', said grandma. 

With this information the girl wrote her essay. When the teacher asked her later to read it in front of the class, she stood up and began, "There has not been a natural birth in our family for three generations..."