Reyt and colleagues report that “Crowded waiting areas are volatile environments, where seemingly ordinary people often get frustrated and mistreat frontline staff…. we suggest an intervention that can ‘massage’ outsiders’ perceptions of crowding and reduce the mistreatment of frontline staff. We theorize that providing information for outsiders to read while they wait on a personal medium (e.g., a leaflet, a smartphone) reduces their crowding perceptions and mistreatment of frontline staff, compared to providing the same information on a public medium…