subway code of conduct.

So today on my blog, I would like to pose a question. I honestly need to know...

Where the HELL are you supposed to look while you're on the subway? Is there a Code of Conduct book? Or is it more like a Choose Your Own Adventure novel?  I feel like it's some  sick form of Russian Roulette if you look directly into people's eyes.

So... Could someone please tell me where I should be looking? I need a Subway Eyeball Guide for Dummies.

Thanks!

xoxo, Jennifer.