The biggest -- and to me the best -- example is the hoary old claim of the creationists: "You haven't found the missing link!" This is important for two reasons: (a) creationists made their one big prediction that no intermediate (sub-human) species existed; and (b) evolution predicted that such must have existed, and that perhaps one day their fossils would be found. A perfect setup for the creationists to test their "scientific" theory.
But now that this one crucial cornerstone of creationism has been shattered (i.e. special creation of man with no intermediate species), they still won't give up. They never do; they never will. And they never make predictions any more -- except for one, which is technically outside of evolution theory, but not "creation science." They all predict that life can never be generated from non-living material. If that little trick ever gets accomplished, and the creationists are then batting 0 for 2, they still won't give up (that's my prediction).
We've been over this ground with g3k, among others. They have already moved the barracades in anticipation of laboratory created life. It will, you see, be the product of design.
In war this is known as a pre-emptive counterattack.