"With ominous frequency, I can't think of a right word. I know there is a word; I can visualize the exact shape it occupies in the jigsaw puzzle of the English language. But the word itself, with its precise edges and unique tint of meaning, hangs on the misty rim of consciousness. Eventually, with shamefaced recourse to my well-thumbed thesaurus or to a germane encyclopedia article, I may pin the word down, only to discover that it unfortunately rhymes with the adjoining word of the sentence. Meanwhile, I have lost the rhythm and syntax of the thought I was shaping up, and the paragraph has skidded off (like this one) in an unforseen direction."
-John Updike, The Writer in Winter, from AARP Magazine (that's right)