OT: Joke from the 60's or 70's

Does anyone here know an old joke from the 60's or 70's that containing the line "Lady your sign fell down!" I've googled the phrase and haven't come up with any fruitful results and figured if anyone knew what I was talking about, it would be someone here. I've heard the phrase several times and figured out through context that it's probably a dirty joke, but I can't for the life of me figure it out. I'm hoping someone here has heard it or knows where this phrase comes from.

Thank you in advance and best regards, Big Z

Riddler wrote in news:[email]:

Found

---begin quote--- Fellow is having a good time in a whorehouse, in one of the fourth floor rooms, which faced the street. He's walking around the room behind the lady of passion with her impaled upon his member.

Heading toward the window, he trips and the two of them fall out the window. Together, they land on the sidewalk, and are both knocked unconscious, still locked in their embrace.

No notice of this is taken, until the madam hears a knock at the door. "Yes, sir, may I help you ?" she asks.

"Uh... excuse me, but is this a whorehouse, right ?

Well... uh... yes, it is. But how did you know ?

He pointed to the couple on the sidewalk and said, "Your sign fell down !" ---end quote---

"Riddler" wrote in message news:[email]...

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Mommy, turn on your headlights!