Brake fluid mixed with Clorox makes smoke, and lots of it. A six year old can start a fire with a flint rock even though a 36 year old man says they can only do it in the movies. A magnifying glass can start a fire even on an overcast day. Certain Lego's will pass through the digestive tract of a four year old. Play Dough and Microwave should never be used in the same sentence.
Super glue is forever.
No matter how much Jell-O you put in a swimming pool you still can't walk on water. Pool filters do not like Jell-O. 15. Garbage bags do not make good parachutes. Marbles in gas tanks make lots of noise when driving. You probably do not want to know what that odor is.