If a politician murders his mother the first response of the press or of his opponents will likely be not that it was a terrible thing to do but rather that in a statement made six years before he had gone on record as being opposed to matricide.
I can mention many moments that were unforgettable and revelatory. But the most single revelatory three minutes was the first time I put on scuba gear and dived on a coral reef. It's just the unbelievable fact that you can move in three dimensions.