If you don't laugh at this one, you're not breathing.

A firefighter 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 firefighter's helmet. The wagon was being pulled by
her dog and her cat. The firefighter walked over to take a closer look.

"That sure is a nice fire truck," the firefighter said with admiration...
"Thanks," the girl replied. The firefighter 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."