Part of the reason the M-R system has never caught on with the general public is that it liberally uses two diacritic marks: the apostrophe and the breve.

CNN: From Our Correspondent: You Say Bulgogee, I Say Pulgogi

" Never in my life have I heard their growling r's, as in "Excurrrse me, I need to aks a qurrrrstion.

NPR: Teaching in a Forgotten Part of America

R. departments no longer have the resources to promote in-house programs, or never did.

FORBES: Making the "Body Corporate" Healthy Starts with Employees

The MPAA has never revealed its guidelines for what qualifies a movie for a G, PG, PG-13, R or even the dreaded NC-17 rating, but Hollywood producers have a second sense for the tipping points between categories.

WSJ: Roger Ebert on Movie Ratings