Don't look at porn on the goddamn subway!
Although this should be common sense, it bears mentioning that you absolutely, 100% should not watch porn on the subway. This is non-negotiable. New Yorkers may proudly consider themselves unfazed, or perhaps even invigorated, by the nasty stuff they see every day, but that doesn't mean they should be subjected to watching you browse your favorite XTube channel during rush hour. Also, please wait until you get home to self-diagnose ailments and/or questionable moles on WebMD. We really don't want to see that, either.
Don't let The Man seize your last place of refuge
One of the unintended consequences of getting cell service underground is that we lose that brief and wondrous window of respite during which we once couldn't be bothered by work email. It also means that instead, we may be expected to get a jump on our workday before it even begins, and past when it's over. However, that can only happen if we allow it to become normal behavior. So, please abstain from work emails en route to and from the office. Let's take a cue from France and other wise first-world countries and start disconnecting when we aren't on the clock. Cool? Cool.