A fireman is polishing his fire engine outside the fire station when he notices a small girl nearby sitting in a little red cart with little ladders hung on the side and a garden hose tightly coiled in the middle.
The girl is wearing a fireman's helmet and has the cart tied to a dog and a cat.
The fireman walks over to take a closer look:
'That's a lovely fire engine,' he says admiringly.
'Thanks,' says the small girl, proudly.
The fireman looks closer and notices the girl has tied one of the cart's strings to the dog's collar, and the other to the cat's t*sticl*s.
'Little colleague,' says the fireman, 'I don't want to tell you how to run your own fire engine, but if you were to tie that rope around the cat's collar as well, like you did the dog, I think you could probably go a lot faster.'
The girl pauses for a moment, looks at the wagon, at the dog and at the cat, then shyly looks into the fireman's eyes and says:
'You're probably right, but then I wouldn't have a f**king siren, would I?'