Themes in written jokes and collative attributes of joke bodies and punchlines interacted in their relation to rated funniness. Tendency (sex) jokes were found funnier the more predictable and expected, and the less surprising the punchlines were found, while one class of non-tendency jokes (verbal put-ons) were rated to be funnier the more unlikely and unusual the occurrences within the joke bodies were rated. Funniness of both joke types was positively correlated with the punchlines' appropriateness. The rated collative attributes of the jokes accounted for a substantial amount of variance in independently derived preference spaces for a subset of the joke sample.Three sets of variables seem to contribute to the appreciation of humour stimuli (Godkewitsch, Note 1, 1974). First, characteristics of the receiver such as his personal problem areas, intelligence, sex, and developmental stage affect humour responses. The social context of the humour stimulus provides the second group of variables. For instance, a comedian leads his audience to expect something funny rather than something tragic. Third, stimulus properties can determine the intensity of humour responses. The present study concentrates on the impact of the third set of variables on the enjoyment of jokes.The thematic and collative properties of jokes represent two kinds of basic stimulus properties. Thematic properties have to do with the subject matter: jokes are often distinguished into tendency jokes, whose contents are formed by affective themes such as sex and overt aggression, and nontendency jokes, such as clever jokes, puns, and riddles that motivate problem solving activity. Experimental evidence confirms the importance of themes for funniness evaluation. Godkewitsch (1972), for instance, showed that the perceived amount of sex in sex jokes varied positively with scaled funniness. Collative properties, for example, ambiguity, novelty, surprisingness, and incongruity have to do with the stimulus' structure. They have been