Are there events in history that you thought you knew about but then you learn details much later that totally surprised you?

I watched the movie Chappaquiddick this weekend, and although I thought I knew a lot about the story, I had no idea that it unfolded on the same weekend as the moon landing. For those that don’t know, Senator Ted Kennedy had a car accident in which a woman died. He tried to cover it up for a few hours, but even the moon landing did not distract reporters from being all over this story. Some say it ruined Ted’s chance of ever being president.
Is there anything in history that surprises you?