Johnny Becomes A Fireman With A Wagon

A man was walking on the sidewalk and noticed up ahead that Little Johnny was
wearing a red fire man's hat and sitting in a red wagon. It appeared that the
wagon was being pulled slowly by a large Labrador Retriever.

When he got closer to the lad, he noticed that Little Johnny had a rope tied
around the dog's testicles, which probably accounted for why the dog was walking
so gingerly.

Smiling, he spoke to the little boy, "That's really a nice fire engine you have
there son.  But I'll bet the dog would pull you faster if you tied that rope
around his neck."

"Yeah," Little Johnny replied, "but then I wouldn't have a siren."