Pluto
We love this post because it really tells us a lot about how this family works. The parent here tried to teach their daughter a lesson about where plutonium comes from, explaining that it was from Pluto. It sounds cute if they were joking with their young daughter, but they were dead serious.
The daughter, who apparently goes to school and pays attention there unlike one of her own parents, knew that was all nonsense. Good for the little kid for standing her ground and calling out that wild claim. Pluto has gone through enough, jumping back and forth between being called a planet and a dwarf.