There is no such thing as child-proofing your house. If you spray hairspray on dust-bunnies and run over them with roller blades, they can ignite. If you hook a dog leash over a ceiling fan, the motor is not strong enough to rotate a 42-pound boy wearing Pound Puppy underwear and a Superman cape.
Baseballs make marks on ceilings.
You should not throw baseballs up when the ceiling fan is on. When using the ceiling fan as a bat you have to throw the ball up a few times before you get a hit. A ceiling fan can hit a baseball a long way. Brake fluid mixed with Clorox makes smoke, and lots of it. A magnifying glass can start a fire even on an overcast day.