Humour in trolley problems and other sacrificial dilemmas: killing is not funny at all.

Three studies were designed to explore a major criticism of sacrificial dilemmas, namely that their potential humorous aspects may distort moral decision-making. We collected moral responses (i.e. moral judgment and choice of action) but also asked participants to rate the funniness of moral dilemmas, in order to combine humour assessment and moral responses. In addition, the emotional responses to moral dilemmas were recorded for both men and women (including emotions related to humour), and the potential effect of individuals' need for humour was also considered. Overall, three main results were reported. Firstly, the dilemmas used in our studies were not rated as funny at all. Secondly, reading moral dilemmas increased negative emotions (i.e. sadness, disgust, guilt) and decreased positive emotions associated with humour (i.e. joy, amusement, and mirth), with gender effects since women experienced stronger negative emotions than men. Thirdly, funniness ratings of sacrificial dilemmas did not vary according to gender and need for humour. This series of studies does not report empirical evidence to support the humorous aspects of trolley-type dilemmas, but invites a more systematic examination of how sacrificial dilemmas are perceived by participants who have to produce moral responses.