From Speech Therapy--Or What?

I remember a sentence from my youth in the 60s. I had thought it was something my parents said for fun, like "How much wood would a wood chuck chuck if a wood chuck could chuck wood." Now I'm not so sure. It may be something I had to say in speech therapy to correct my lisp, though my lisp was for R not for S. Here it is:

Theopold Theopolis thrust three thousand thorny thistles through the thick of his thumb.

It must be important. Why would I remember it this long if it wasn't. But I don't find any references to it on the Web. Is it possible that this piece of our culture has avoided rampant webification? Or maybe it was just something my parents made up. Is it possible?