..and let's just add the synopsis of King's Graveyard Shift to further emphasize why we need pest control:
A young drifter named Hall has been working at a decrepit textile mill in a small town in Maine when his boss, a cruel taskmaster, recruits him and others to assist with a massive cleaning effort. The basement of the old mill has been abandoned for decades, and over the years, a monumental infestation of rats has taken hold. This rat empire, cut off from the rest of nature, has allowed the animals to evolve into a strange and varied combination of creatures; complete with its own bizarre, self-sustaining ecosystem. There are large, armoured rats, albino, weasel-like rats that can climb up walls or burrow through the ground; and bat-like rats that have evolved to pterodactyl-like sizes. The men eventually come across a sub-basement, locked from the inside, that harbors something more terrifying and hideous than any of them could have dreamed—a cow-sized queen rat with no eyes or legs, whose only purpose is to endlessly breed more rats. The workers, all too late, realize the horrible danger they are in and are devoured by the hordes of mutated rats.
Meanwhile, the other team of workers on the surface wonders what has happened to them and, with no idea what kind of horror awaits them, prepares to descend into the basement.