In the case of Tunisia, it was indeed this single act that sparked what had been long-standing active protest movements and moved them forward. But that's not so unusual. Let's look at our own history. Take the civil rights movement. There had been plenty of concern and activism about violent repression of blacks in the South, and it took a couple of students sitting in at a lunch counter to really set it off. Small acts can make a big difference when there is a background of concern, understanding, and preliminary activism.