A fireman 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 fireman's helmet. The wagon was being pulled by her dog and her cat. The fireman walked over to take a closer look.
'That sure is a nice fire truck,' he said with admiration.
'Thanks', the girl replied.
 
The fireman looked a little closer and noticed that the girl had tied the wagon to her dog's collar and to the cat's testicles.
 
'Little Partner,' the fireman 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 girl replied thoughtfully, 'You're probably right but then I wouldn't have a siren.