How the lady-training is going

Here is the joke my daughter told us last night:

Shut up, Poop and Manners were in a car. They stopped at a gas station so Poop could go to the bathroom. Manners went out to find him. While they were gone, a police officer went up to the car. "What's your name?" he asked. 
"Shut up," said Shut Up. 
"Where are your manners?" he asked.
"Outside, looking for Poop," said Shut Up. 

My husband dutifully reprimanded her for the potty talk. I was not much help, as I was doubled over with laughter. Shaking, uncontrollable laughter.