It’s 1940 and Britain has been lucky to bring so many of her troops back from Dunkirk.
If Winston Churchill had PowerPoint and the auto content wizard at his disposal,
this is how his visual aids might have looked...

In 1963 Martin Luther King delivered one of the world’s most powerful speeches. 
It's inconceivable that this great speaker would have added clipart to any visual aids. 
But if he had...

We'll never know what Mark Anthony really said, the speech is Shakespeare's interpretation. 
Had he hurriedly searched the internet for pictures to go with his slides, the mood of his listeners in Rome may have changed...