The Perfect Zero

Professor Blackwood was infamous for his mercilessly difficult final exams, consisting of 25 grueling multiple-choice questions with four options each. When he finished grading his star pupil's paper, the final score was a flat zero. Not a single correct guess. Staring at the disastrous paper, the notoriously short-tempered professor didn't fly into his usual terrifying rage. Instead, his hands trembled as he wept tears of profound joy, and he immediately booked a table at the city's most expensive restaurant to celebrate.