Little Johnny and his wagon

A man is walking down the street. Further down the street he notices Little Johnny. Little Johnny is sitting in a red wagon, wearing a fireman’s hat. The wagon is tied to a dog, by its balls.

The man says to LittleJohnny “Little Johnny you could go alot further, if you tied the rope around the dogs neck.”

Little Johnny replies “If I did that, I wouldn’t have a siren”