A little girl is playing outside a firehouse with her cart, she has a cat and a dog with her and she is using the dog to drag the cart up the road, she has a piece of fishing line tied around the cats nuts.
A fireman comes out and says 'great little cart but you know if you had the cat pulling the cart with the dog you could go twice as fast'
to which the little girl replies 'yeah but I wouldn't have a siren!'