I watched this behavior for over an hour. One of my heritage RIR hens was about to lay her first egg. She was complaining loudly and going in and out of the coop and in general acting discombobulated. My young rooster (Henry) was anxious and acting troubled because of the hen's actions. He also was going in and out of the coop. Finally after about an hour Henry went into the nest and started to make the same noise he makes when he has found a treat for one of the hens. The young hen went into the nest with him, and after a few minutes Henry quitely got out, but the hen left the nest shortl after. The rooster went into the next nest and did the same thing again with the same results. They played musical chairs (nests) for about 20 more minutes until finally Henry stood in the entrance way to the nest and wouldn't allow her to get out of the nest until she laid her egg. When she had finished both of them started what sounded like the egg song. Henry looked into the nest and came out immediatly with her following. This is the strangest behavior I've ever witnessed with my chickens. I'm just so very glad I was able to witness the whole thing.