question #2

This isn't so much a serious question, I just hate riding the metro.
So uh, why does the Metro ALWAYS smell like a combination of burning plastic and feces? Are there always people smoking crack and smearing shit on the walls down there when I'm not looking?
It's the worst on really hot days. For obvious reasons, yes -- but also because they sometimes have these huge fans set up blowing towards the gates. Their hearts are in the right spot, but what it amounts to is you getting a face-full of the foulest smelling air outside of a rendering plant.