My favorite quote from a book these days is this: "You can make buffalo go anywhere, just so long as they want to go there." That one is followed by "You can keep buffalo out of anywhere, just so long as they don't want to go there."
What does that mean? You'll have to check out one of Gerald Weinberg's books for that answer, but for me, these quotes have never been more apropos than for a current consulting situation. The important thing is that I'm trying to get a buffalo to go somewhere for it's own good ... but I don't think I can save this particular buffalo life.