Forgot to add
"Because I said so". I swore I would never use that. I don't really, but do have my own variation of it.
Since we are also adding some of the ones we say:
(keep in mind, calling me sarcastic would be an understatement)
"I'm going to hang you in the forest by your toenails and let the animals have you" (we are surrounded by forest)
"If Mom's not happy, nobody's happy"
"Because I'm Mom, and moms know everything, that's why"
"Don't make me use my "MOM'' voice"
Yet, the most effective is not in words at all, it's "the look". Even scares my husband sometimes.