My sister was bemoaning the fact that she had procrastinated cleaning and organizing her house for a long time.  Since she was planning to entertain, she felt a lot of pressure to get moving.  That afternoon she phoned, sounding glum.

"I went to the bookstore," she explained.  "And I bought a book on how to get organized.  I was all fired up, and decided to clean out all the shelves in the living room.  While I was working, I found the same book.  I had bought it a couple of years ago."