Four conservatism questionnaires (C-Scale; Wilson and Patterson, 1970; POI; Eysenck, 1976; MK; Cloetta, 1983; 16PF-Q1; Schneewind, Schröder and Cattell, 1983) were compared with regard to their ability to predict responses to humour based on the incongruity-resolution structure. We further investigated, whether a prediction of humour responses could be improved by assessing variables like toughmindedness, capitalism, rigidity and intolerance of ambiguity. The results showed that the conservatism scales overlap in their prediction of funniness of incongruity-resolution jokes, sex jokes and rejection of nonsense jokes. Correlations with the other humour scales were specific for certain conservatism questionnaires. A canonical correlation analysis relating the humour scores and the conservatism scales yielded three significant correlations (rc1 = 0.65, rc2 = 0.51 and rc3 = 0.44). Capitalism was also related to appreciation of incongruity-resolution jokes and of sex jokes. The previously found effects of intolerance of ambiguity could be replicated.