Maybe so

[Bogues]

A fireman looked out of the fire house window and noticed a little boy
playing on the sidewalk. He had his little red wagon, and he had hung
small ladders on the side of it, and coiled the garden hose up in it,
and he was wearing a fireman's hat. He had the wagon tied to his dog,
so that the dog could pull the wagon.

The fireman thought this was really cute so he went out and told the
little boy what a great looking fire truck he had.

As he did, he noticed that the dog was tied to the wagon by his
testicles. The fireman said, "Son, I don't want to try to tell you how
to run your fire company or anything, but I think if you would tie
that rope around the dog's neck you would go faster."

"Maybe so," said the little boy, "But then I'd lose my siren!"