But we don't have a tail!

After Emily mopped the Kitchen floor, I was wiping up the excess water, and Emily was sliding across the wet floor and slipped. She commented "that was fun". I told her to be careful or she might break her tail bone. She kind of looked puzzled and then asked, "Where is my tail bone". I showed her, then she replied, "but we don't have a tail".

Side note, why isn't it as fun for Emily to clean her own room as it is the rest of the house.