The PhD defence, or viva, is significant academic rite of passage, which as well as marking the culmination of years of study, can also be a highly charged emotional moment. Drawing on years of collecting accounts of PhD defences on her blog and her recent book (Planning and Passing Your PhD Defence, co-authored with Olga Degtyareva), Eva Lantsoght, discusses how both PhD students and supervisors can benefit from a more engaged understanding of the emotions underlying the PhD defence