Like, say, when the City of Boulder accidentally posted a list of 60 sites where medical marijuana is grown. Or the federal government accidentally published a 266-page report on the location of stockpiles of fuel for nuclear weapons and other materials. Or venture capitalists Kleiner Perkins published detailed plans of companies planning iPhone applications. Or Mozilla published the usernames and passwords of 44,000 users of its add-ons section.
Usually I'd add something about the value of data loss protection to keep things like that from going out, but it's not much use on the timing of something that is supposed to be published in an hour anyway.
Sometimes, no matter what the technology people can do to prevent it, end users are going to let the dog out of the house and someone's going to have to go see the neighbor with a scooper and a little plastic bag.