Last week on Car Talk, the "Puzzler" was thus: There is a word which, when pluralized, contains none of the letters of the singular version of the same word. I listened to the program this morning hoping to find out the answer, after being unable to come up with it myself in a week of trying, only to find out that The Puzzler is taking the week off and the answer won't be revealed until next week. So, how about it, all you wordsmiths? What could be the answer to this Puzzler?