Haven't I heard this somewhere before?
From Soul of a New Machine (1981):
A young computer engineer, known to be one of the most skillful in Westborough’s basement, said he had a fantasy about a better job than his. In it, he goes to work as a janitor for a computer company whose designs leave much to be desired. There, at night, disguised by mop and broom, he sneaks into the offices of the company’s engineers and corrects the designs on their blackboards and desks.
Name. that. movie.
