The little girl and the fireman

A firefighter is working on the engine outside the station when he
notices a little girl next door 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 over to take a closer look.

"That sure is a nice fire truck," the firefighter says with admiration.

"Thanks," the girl says. The firefighter takes a closer look and
notices the girl has tied her wagon to the dog's collar and 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 thoughtfully, "You're probably right, but then I wouldn't have a siren."