I've been reading Matilda by Roald Dahl to my 5 year old before bed the last few nights. If you're unfamiliar with the book, it's funny and quite a good story, great for my son.
In the book, Miss Trunchbull (pictured above) runs the school Matilda attends as an abusive, brutal dictator. All the children fear her.
One of Matilda's friends, Lavendar, tells her that if her father found out she had been abused he would raise a "terrific stink".
Matilda tells Lavender that he he wouldn't, and Lavender fires back that of course he would.
He wouldn't and the reason is obvious. Your story would sound too ridiculous to be believed. And that is the Trunchbull's great secret...
Never do anything by halves if you want to get away with it. Be outrageous. Go the whole hog. Make sure everything you do is so completely crazy it's unbelievable. No Parent is going to believe [the things she does], not in a million years. Mine wouldn't. They'd call me a liar.
Not a bad insight from a children's book.