It's like this...

Lars sent the girls into the bathroom to brush their teeth.  For the next ten minutes there was a constant stream of chatter and when I say chatter, mostly I mean the girls instructing each other on the proper way to brush their teeth, squeeze the toothpaste, flick off the excess water, wipe their mouths and whatever else they could find to nit-pick each other about. 

When they finally came back into the living room Lars asked, "Is it possible for you girls to be in a room with each other without bickering?"

 Leah shrugged her shoulders and replied, "I don't know.  It's never happened before."