If you start typing "phn" into Google's search box, several suggestions pop up.
Most are of a Vietnamese character, though for some reason "pneumonia" is included. Phneumonia? None, though, is in Mad Arabish!
Adding the apostrophe gets "phn'glui" (which is a good start) and "phns" (which makes no sense).
Now, I could have sworn that, not so long ago, just "phn" got The Complete Phrase as one of the suggestions.
Did the Starry Wisdom Church, or perhaps the Alhazred estate, demand that the phrase be scrubbed?
Anyway, if you've ever wondered how "Phn'glui mglw'nafh Chthulhu R'lyeh wagn'nagl fhtagn" is pronounced, here's someone singing it. Run! Well, at least he didn't speak the name of H*stur.