The book that changed your life

The question has become commonplace in published interviews with authors and other bookish people. I think I just read the best answer yet given to that question:

Book that changed your life:

Introduction to Computer Data Processing, Third Edition, 1984. If this textbook had not so clearly described how god-awfully boring a career in information technology was, I may have made some early career decisions that were even worse than the ones I did make.

Credit to William Gurstelle, interviewed in Shelf Awareness and quoted at the NewSouth Books blog.