A man was driving down the street when he saw a little boy with a fireman's hat on. The boy was sitting in a little red wagon being pulled by a black lab.

He thought, "This is the cutest thing I've ever seen. I've got to stop and talk to this little boy."

The man got out of his car and said, "Son, that sure is a nice fire engine you've got there, but don't you think he would pull a little better if you had that rope tied around his neck instead of his balls?"

The little boy looked at him and said, "Well, I guess he'd pull a little better, but then I wouldn't have a siren!"