Characters
This job would be great if it wasn't for the fucking customers.
— Randal · Clerks
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker says the job would be excellent if not for customers, the people it exists to serve. The joke is the built-in contradiction: the one thing the work depends on is also what ruins it, delivered as a blunt, profane complaint about the public.
Context reviewed