Eavesdropper

You make a habit of listening in on conversations and glancing sideways at what others are doing. Roll a Quick Contest with your target(s) whenever you have a chance to do this.

You may use basic Per, Lip Reading, or Observation. They may use Per or Observation – and if several people are involved, use the highest score among them.

If you win you may learn what’s going on, which is rather dull most of the time; the GM is free to say, “Boring chatter.” A tie means nothing happens. If you lose, the other party notices you before you learn anything and the GM will make a reaction roll at -1, though consequences worse than scowls or a terse “Mind your own business!” are rare.

This is just a quirk because it covers an activity that most adventurers engage in. The difference here is that you can’t opt out – you don’t even know you’re doing it.