I am SO in over my head (part 1)

I swear on whatever semblance of dignity I may have left that this was actually said today:

                  SOPHIA
      Mommy. There is no screaming
      in the car. In the car we use 
      indoor voices. We can scream 
      when we're outside but not when
      we're in the car.

Should I just wave the white flag now, or wait until she’s old enough to challenge me to three card monte?