Unbelievable!
I was watching a bit of news this morning about Hurricane Charley. The news anchor kept referring to the damage as "unbelievable." Actually, I think a 100 ton purple elephant strolling across southern Florida would be unbelievable. A class 4 hurricane causing damage is terrible, but I can certainly believe and expect that would happen.

Wait till there's an earthquake in California, that will be really unbelievable!
I would be completely surprised!