What's the most unexpected or serendipitous encounter you've had with a stranger?

Stuck in an elevator with a stranger, initially awkward silence, then a shared joke sparked a conversation, revealing a surprising connection - we both worked in the same field, and her advice helped me land my dream job.

Crossing paths with a street musician, their music resonated with a deep emotion I couldn't place, then they shared their story, leaving me touched and forever changed.