I think this is a great example of how much spirit a Social Practice project can contain. Fifty people, one question: "What is your secret?"
Maybe we don't know everything. And maybe the things we don't know are the most important bits.
Think of some of the characteristics of this while considering the different forms your ideas can take.
Limitations: Everyone is answering the same question.
Means: Interrupting routine and/or providing a social conduit
Outcomes: Make someone question/Make someone feel relief