Life is full of unspoken social rules. Don't talk in elevators. Leave an empty urinal between you and anyone else in the men's room. When someone says "how are you?" as a greeting, it's not an offer for free psychotherapy. These rules differ in different countries and situations, but apparently, in Stockholm, Sweden riding the train is a lot like riding the bus in Madison, WI.
 

It's okay to look at people, but don't make eye contact.

This rule is also the only rule in the latest Mazapan game, "Metro Rules of Conduct". Use the arrow keys to direct your gaze to your fellow passengers. Look at what they're wearing, gaining more points for staring longer, but look away before you risk making any embarrassing eye-contact!

Metro Rules of Conduct is a fine example of a video game as Art. It's social commentary. It forces people who take public transportation to analyze a social rule that might remain subconcious.  It also has the ability to teach everyone else something it might otherwise be embarrasing to learn. That's the value of educational games, right? Give learners some of the benefits of real experience while taking away the risk.

Of course, the risk of eye-contact on a train in Stockholm isn't all that dire, but we could apply the concept of simulating social rules to more complicated situations such as a job interview in Japan, or bartering for goods in Morocco.

Play Metro Rules of  Conduct