The most exciting thing I can learn about anyone boils down to this:
They really, truly give a damn about something.
It’s important to calibrate what I mean about this. Being a stickler about Star Trek trivia, parts of speech or state capitals doesn’t count. Affinity for political knee-jerk doesn’t qualify, either.
Giving a damn is about sacrifice and investment. It’s paying with something precious, in the service of something you really, truly value.