²³Diana Smay: ‘The Disease of Ritual: Obsessive Compulsive Disorder as an Outgrowth of Normal Behavior’, ⟨http://www.emory.edu/COLLEGE/MARIAL/pdfs/ObsessiveCompulsive.pdf⟩. See also my ‘Ritualets grenser: Ritualbegrepets nytte og skade’, i Ritualer i kontekst, ed. by Mette Birkedal Brun and Kim Esmark, Kirkehistoriske fragmenter, 2 (Copenhagen: Department of Church History, The Theological Faculty, University of Copenhagen, 2004), 175–192, where I discuss safety demonstrations on airplanes as rituals of death (pp. 183–84).