I like that you say "maybe" about a janitor, because at some point a filthy office will break a product.
Oh, you’d be surprised how much damage a janitor can do (me remembering the time the cleaning guy at my dad’s lab accidentally tipped over a whole shelf of mice)
Wasn't there a story recently about a janitor ruining 20 years of research or something?
It was something about someone getting annoyed over an alarm from a refrigerator and deciding to pull the plug.
It was something about a bunch of scientists who failed to operate a refrigeration system properly.