Impatience or Stubborness?

Sometimes when I go into the hen house, I find an egg on the floor in front of the nesting boxes. Had the hen gone into the hen house and found another hen in her favorite nest? They have favorite nests, as I'll sometimes find five eggs in one box, one in another, and none in the other three. Determined hens will sometimes double up in the boxes. Sometimes I'll find two hens in one box, one each in a few others, and a few that are empty. Or, was the hen enjoying the spring day, the feast of worms and grass? Was she finding this whole egg-laying thing a bother? Did she come inside, lay her egg, and head outdoors to more exciting things?