There have been many times I have been tempted to use the "Because I said so" road. In such cases it has usually come out like this;
Because I am the parent, you are the child,
I am responsible for you and the way this house-hold runs,
When you are old enough you will move out and have your own house-hold and quite possibly, a family,
That is when you can decide how best to be responsible for yours.
Thankfully I have not had to use this too often, it's pretty much respected.