If your waffle making daughter can't sleep at night because her pet mouse is running on the wheel and she puts the mouse's cage on the top step leading to the basement without mentioning it to anyone and then closes the door, it's possible that you'll get up the following morning, decide to wash your sheets, open the door to the basement, hands full of sheets and, unable to see below, step on the cage, fall backwards on your behind, and send the cage flying through the air, only to land ten feet below with a loud crash. It's also possible that the mouse will live through the ordeal . . . as well as the daughter.
Just in case you were wondering.