In Matilda What did the Trunchbull do to the boy who couldn't spell the word what?

In "Matilda," the Trunchbull punishes the boy who can't spell "what" by forcing him to stand in a corner and then humiliating him further. She takes the extreme step of making him face the wall, demonstrating her cruel and tyrannical nature as a headmaster. This incident highlights her abusive behavior towards the students, as she often resorts to intimidation and punishment rather than encouragement or support.