This guy was walking down the sidewalk when he sees a Little Johnny wearing a red firefighter's hat and sitting in a red wagon which is being pulled slowly by a large Labrador Retriever.
When he got a little closer, he saw that the kid was holding a rope which is tied to the dog's testicles
which may explain why the dog is walking so slowly.
Going up to the kid, he said,"That's a nice fire engine you got there, but I bet it would go faster if you have the rope around the dog's neck."
"Yeah," the kid replied."But I wouldn't have a siren."
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cos yer worth it