A fire-fighter was working on the engine outside the station, when he noticed a little girl nearby in a little red wagon with little ladders hung off the sides, and a garden hose tightly coiled in the middle.
The girl was wearing a fire-fighters helmet. The wagon was being pulled by her dog and her cat.
The fire-fighter walked over to take a closer look. "That sure is a nice fire truck," the fire-fighter said with admiration.
"Thanks", the girl replied.
The fire-fighter looked a little closer. The girl had tied the wagon to her dog's collar and to the cat's testicles.
"Little partner", the fire-fighter said, "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 replied thoughtfully, "You're probably right, but then I wouldn't have a siren."