One consistent factor in all of WWE's advertising over the years for big shows and for small is the phrase "card subject to change." Basically, it's a disclaimer letting the fans know that what's been advertised isn't exactly what they might get, and in a sport where dozens of competitors have to fly from all over the country to work any given show, it's a sensible heads-up to offer. In fact, it's surprising said cards don't change more often. Let's also not forget that this is wrestling, and injuries are commonplace. When matches are hyped weeks in advance and wrestlers can be hurt at any given time (even in training), major cards are often restructured. Fans understand these risks, and afford a certain amount of leeway to WWE's matchmakers. Worse, though, are bait and switch situations times when a specific match is promised though the company knows delivery is impossible. When those happen, fans often end up disappointed and sometimes end up taking their money elsewhere. Here are ten situations where matches were announced for Pay-Per-View events and were changed maybe due to injury, maybe due to booking, or maybe due to some very strange concerns. Sometimes it was for the better, and sometimes, well, it was just unavoidable.