Fresh out of high school, I found a job cleaning the elegant home of an older couple.  Among other duties,
I had to dust their many imported carvings and petrified collectibles as well as pick up after their pets.

One day I was astonished to find two ivory fossils lying on the floor beside the bookcase.  I quickly
picked them up and put them back on the shelf.  The next week the same thing happened.

That afternoon my employer came into the parlor, her faithful canine behind her.  Looking around, she eyed the bookcase. "Tippy," she asked the dog,  "how do your bones keep getting up there?"