In the scrubs episode "my dirty secret" what job is dr. cox talking about when he says: ?

Question

But, what the hey, my pay is about the same as guys who break rocks with other rocks and I only have to work three or four hundred hours a week, so, so far I'm a pretty happy camper!

Answer 1

I always thought that he sarcastically meant prisoners working at hard labor who make nothing at all - like old movies from San Quentin when they had to smash the rocks down onto the pile of others to break them without tools.  

God, I love that guy's rants!  What a great show...