"'What is a Human?' said the sheet, Tom wanted to upset Miss Roddle, 'Great people,' Tom wrote on it, the answer suddenly faded away and appeared on Miss Roddle's sheet."
—The spell is placed on STOW test sheets

This spell is a spell used on STOW test sheets. If the students writes a wrong answer on the sheet which the teacher doesn't approve of, it disappears from the student's sheet and reappears on the teacher's sheet.

Thomas Joshman tried upsetting Susan Roddle by writing Humans are great people. But, without him knowing, the sheet had a wrong answer spell and he earned a deadly detention.