knock-it-off

Imagine you're driving the kids someplace, and they're making a ruckus in the back. What would you say to return order to the car?

• Knock it off!~
• Don't make me turn this car around!~
• Do you want to ride on the outside of the car?~
• What's all this then?! Don't get your knickers in a twist!~
• Don't make me come back there!~
• Do I have to separate you?~