to have one major role-playing experience, which sort of tries to set the stage for an actual demonstration for an actual sit-in. >> you talk about the civil rights movement in the '60s. people talk about selma, birmingham, confront. but the incubator of it is nashville, tennessee, where james lawson started teaching his classes on nonviolence. teaching people like john lewis, dane bevil, diane nash, how to not swing back if somebody hits you with a nightstick. >> we actually practiced sitting in. some took the role of students who were sitting at a lunch counter and others took the role of white thugs. we were practicing how to remain non-violent even in the face of violence. >> there had been other sit-ins