50 years ago today, Martin Luther King gave what is generally called the greatest speech of the 20th century. Symbolically standing in front of the man who had signed the Emancipation Proclamation "five score" years prior, he delivered, over a scant 17 minutes, a most eloquent "screw you" to Southern racists and congressional cowards—the backwards shitheads who had co-conspired with water hoses and Jim Crow laws to prevent African-Americans from voting, attending proper schools, or making enough to support their families. King made his case with logic and by calling to the same higher power his enemies claimed to believe in. It's masterful.
Whether you've seen the speech before or not, it's worth carving out the time to watch the full 17 minutes. King builds up the drama with brilliant metaphors—at the four-minute mark, he talks about Americans "giving Negroes a bad check" and extends the analogy for a full minute—and by the time you get to the classic "I have a dream" segment, you see how well he was able to tie together each grievance that deserved to be made. Take a look.