Theopholous Phifter

Courtesy of Johnny Miller's Grandfather. He was full of funny stories and quotes and tongue twisters. This one may not originally be his, but Johnny Miller had never heard it anywhere else before. So, as a young boy, after conquering the age-old Peter Piper, Johnny Miller learned to quote this one, as well:

Theopholous Phifter, the Thistle Sifter, sifted a sifterful of unsifted thistles in his thistle sifter.

But, if Theopholous Phifter, the Thistle Sifter, sifted a sifterful of unsifted thistles in his thistle sifter,

Where's the sifterful of sifted thistles, that Theopholous Phifter, the Thistle Sifter, sifted in his thistle sifter?