I had a similar idea to this: However it was more of a daydream about how to escape the misery of so many unhappy people wasting x hours of their lives per week.

I thought it could be cool to have a kind of train/carriage discussion topic that you could browse. The most amusing thing about it is imagining people who didn't know about the app wondering onto the train and being overcome with horror at all the people talking to each other :-)