Results and Analyses -------------------- Following our stopping rule, we ran the study until we collected data from 150 participants. Around a third of participants identified their gender as male (*n* = 48). The age of participants ranged from 17 to 67 years (*M* = 21.10, *SD* = 7.21). All participants identified themselves as students, with the exception of one participant who did not provide a response to this question. Applying the standardized exclusion rules reduced our sample size to 117 participants (Smile/teeth *n* = 59; Pout/lips *n* = 58). The independent samples t-test was not statistically significant, *t*(115) = -0.39, *p* = .65, *d* = -0.07, 95% CI [-0.44, 0.29]. Participants in the smiling condition did not rate the cartoons as significantly funnier (*M* = 4.91, *SD* = 1.54) than those in the pouting condition (*M* = 5.02, *SD* = 1.64). As part of our preregistration, our laboratory included an additional exclusion rule. Specifically, we included a question at the end of the study that asked participants whether they had previously learned about the facial feedback hypothesis. If they indicated that they had, they would be excluded. Applying this additional exclusion rule reduced our sample size further to 106 participants, with an equal number of participants remaining in each condition. Results were similar, with the independent samples t-test remaining not statistically significant, *t*(104) = -0.42, *p* = .66, *d* = -0.08, 95% CI [-0.47, 0.30]. Once again, participants in the smiling condition did not rate the cartoons as significantly funnier (*M* = 4.81, *SD* = 1.55) than those in the pouting condition (*M* = 4.94, *SD* = 1.68).