"You can't sit there"
In February of 1960, four college students went into a Woolworth's store and sat down at one of the lunch counters. When they were told that they weren't going to be served and they had to get up and go to the back of the store, they remained seated. This act inspired a lot of people to do the same thing to earn equality across the country. It is recognized as the most important sit in the history of the Movement.