A fireman is outside working on the fire truck when he notices a little girl next door.
She is in a little red wagon, with little ladders hung off the side, is wearing a fireman's hat and has the wagon tied to a dog.
The fireman says, "Hey little girl, that sure is a nice fire truck."
"Thanks, mister," she says.
He looks a little closer and notices the dog is tied to the wagon by its testicles.
"Little girl," he says," I think if you tied the rope around the dog's neck you'd go faster."
She replies, "You're probably right, mister... but then I wouldn't have a siren."