The problem with this is that /someone/ knows why. And they'll mention half the story to someone else. Then that person will mention mostly the same half story and interject 10% more. And then the person who heard that will completely mangle the whole thing. It's a game of telephone. Eventually the rumor mill is super excited and has the completely wrong story which ends up getting people all worked up about their place in the organization. The only thing to do then is for the company to "come clean"...but then half the people think they are just covering things up.

It's a tough balancing act, but you have to give your employees something or they'll just go and make everything up themselves. It's really hard to put that genie back in the bottle.