My 3 year old nephew used to always say "Daddy, there is a fire in the wall" and they were like...."okay...." after the 5th or 6th time he said this they had an electrician over to fix a broken outlet. They told SIL that the wires in the walls were days away from an electrical fire
Nephew also used to see a tall man with a black hat that would play with him and get him in "trouble" for not going right to sleep in his room!!