See:

    http://en.wikipedia.org/wiki/Lily_Tomlin
    ...
    Career
    In 1969, Tomlin joined the sketch comedy show Laugh-In. Some
    characters from the show have been associated with her throughout
    her career, including the wisecracking, snorting telephone
    operator, Ernestine; ...

Ernestine was known for placing telephone calls to victims\\\\\ customers
and, while waiting for the call to be answeredr, saying the output from
the above FORMAT out loud, to wit:

    one ringy-dingy...
    two ringy-dingy...
    three ringy-dingy...

+---------------
| (which also has advantage of avoiding a style warning for LET*!)
+---------------

Sorry 'bout that. An earlier version looked like this:

    (let* ((s "ingy")
           (x (format nil "r~a-d~a..." s s)))
      (format t "one ~a~%~:*two ~a~%~:*three ~a~%" x))

but I realized I could use the backup trick to avoid duplicating
the string arg and so got rid of the temporary variable S, but then
didn't change the LET* to a LET. Happens a lot in exploratory code.

[Note that none of CMUCL, CLISP, nor SBCL (at least, not the versions to
which I have access) give the annoying, overprotective "style warning" for
a LET* with only one binding that your implementation apparently does.]

-Rob