Coming in there with a stick
The commonly used parental threat (usually empty threat) of intimidating one's child (or other subordinate) into doing what is asked of them. Very often used on defiant children when they refuse to go to bed or obey their parental figure.
Son: I'm not going to go to bed...I'll stay up as long as I want!

Dad: The hell you are! Get to bed or else I'm coming in there with a stick!