What did you Trunchbull do to the boy who couldn't spell the work what?

In Roald Dahl's novel "Matilda," Miss Trunchbull, the formidable headmistress, punished the boy who couldn't spell the Word "what" by making him eat an entire chocolate cake in front of the whole school. This punishment was meant to be both humiliating and excessive, reflecting Miss Trunchbull's cruel and tyrannical nature as a character. The scene serves to highlight the absurdity and injustice of her disciplinary methods within the story.