Captain Underpants and the Attack of the Talking Toilets

["School stories" "Humorous stories" "Juvenile fiction" "School principals" "Fiction" "Captain Underpants (Fictitious character)" "Schools" "School superintendents and principals" "Humorous fiction" "Heroes" "Heroes and heroines" "Caricatures and cartoons" "Children's fiction" "Schools fiction" "Heroes fiction" "Cartoons and comics" "Cuentos humor\u00edsticos" "Escuelas" "Ficci\u00f3n juvenil" "H\u00e9roes" "Superintendentes y directores" "Captain underpants (fictitious character) fiction" "Teachers fiction" "Child and youth fiction" "Toilets" "Inventions" "Schoolboys" "Science fiction"]