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In this study, we examined whether or not exposure to a humorous surround campaign in Iowa (United States) could produce a multiplicative effect based on Intermedia Theory. Until You’re Ready, AvoidtheStork.com^© was designed to prevent unintended pregnancies among young women. In the case of unintended pregnancy, interpersonal sharing is important because women’s contraceptive decisions are influenced by what others, including their friends, think about the health issue. In a sample of college students (n = 594), cross-sectional survey results indicated that campaign exposure and humor were significant predictors of talking with and/or showing the campaign to others. Based on our results, we suggest that campaign practitioners should consider humor-based campaigns as a way to generate not only exposure-based effects but also conversation-based effects. Specifically, humor-based campaigns …