The sweetest moment I ever experienced with a chicken was with my hen, Poachy. She was deathly ill after being attacked by the flock that she grew up with. I nursed her back to health and we established an unbreakable bond. She was no longer accepted by the flock, and she looked to me as her alpha. We were best friends.
I would sit with her and preen her feathers using my finger, mimicking the same gesture that a chicken would do to its flock mate. While sitting on my lap embracing this lovely preening session, my cute black hen began preening me!
This became a daily ritual for the two of us.