"E" is considered the greatest mistake my mother has ever made, even more than when she built a robot that was supposed to clean a litter box but ended up scattering cat waste around the house. This highlights her history of unconventional inventions that sometimes go awry.
The quote comes from James Patterson's book "House of Robots," illustrating a humorous and exaggerated memory that underscores the inventive yet imperfect nature of her efforts. It suggests that her attempts at innovation, while ambitious, haven't always gone perfectly, but they are memorable and impactful in their own way.