Laughing at myself

You know how your world view can be colored by the book you are reading at the time?  Well, I just finished a collection of short stories by Stephen King and one of them was about a guy who collected graffiti and wrote them down in a little book.  Lots of them were really funny or disgusting, take your choice.  Seeing as though I am on a constant search for street art and graffiti, it is one of the constants of this blog, when I saw this one, newly painted, I snapped a shot of it from the car.

And I will be the first to admit it.  I am an idiot.  Because of the short story, my mind went to the bathroom humor vault and I thought this was one of those "for a good time, call..." jokes.  I saw Ester and Liza, two names, but then I put them together and ...duh.
The little animal with the drainage pipe for a mouth might have been a clue.

What was it that Bob Barker always ended "The Price is Right" with? "Ah yes, his signature sign-off: "Help control the pet population. Have your pet spayed or neutered."