again, this is from fabulous fallacies by tad tuleja..... "years ago, when refrigerators were still unknown and the ice-man cameth every day to keep your icebox filled, you had to be pretty particular about what you put in your mouth, especially in the summer months, when food spoilage was a common occurence. in those days lovers of shellfish developed a fairly reliable rule of thumb to remind themselves when to be wary. you could eat oysters and other shellfish in any month with an "r" in it; months without an "r" (that is , the summer months, May through August) were taboo. this was a pretty good rule then, at least in the northern hemisphere, but it became obsolete with the advent of modern refigeration. no oyster now travels cross-country in anything but an air-conditioned car, and as a result, you can enjoy them just as safely in June as in March." ashley montagu and edward darling, the prevalence of nonsence (harper & row, 1967).