A firefighter is working on the engine outside the station when he notices a little girl riding down the sidewalk in a little red wagon with little ladders hung off the sides and a garden hose tightly coiled in the middle. The girl is wearing a firefighter's helmet. The wagon is being pulled by her dog and her cat. The firefighter walks out to take a closer look. "That sure is a nice fire truck," he says admiringly.
Thanks, Mister Fireman," the girl says
The firefighter looks a little closer and notices the girl has tied the wagon to her dog's collar and to the cat's testicles. "Little Partner," the firefighter says, "I don't want to tell you how to run your rig, but if you were to tie that rope around the cat's collar, I think you could go faster!"
The little girl replies sweetly, "You're probably right, but then I wouldn't have a siren..."