There is no such thing as child-proofing your house. If you spray hair spray on dust bunnies and run over them with roller blades, they can ignite. A 4 year-old's voice is louder than the combined voices of 200 adults in a crowded restaurant. If you hook a dog leash over a ceiling fan the motor will not be strong enough to rotate a boy wearing a superman cape. It will be strong enough however to spread paint on all four walls of a 20 by 20 foot room.
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. It's already too late. Brake fluid mixed with Clorox makes smoke, and lots of it.