The current study tested the 7 Humor Habits Program after McGhee (1996, Health, healing, and the amuse system (2. edition): Humor as survival training. Dubuque, IA: Kendall/Hunt Publishing; 2010, Humor as survival training for a stressed-out world: The 7 Humor Habits Program. Bloomington, IN: Author House) in two groups receiving the eight-week training (group sessions; one group additionally completing “Home Play” exercises and one group without Home Play) compared to two control groups (a placebo humor group and a waiting control group). The total sample of 110 adults completed measures on the sense of humor, the temperamental basis of the sense of humor, and life satisfaction at three time points: directly before and after the training time, as well as at a two-month follow up. Additionally, peer-ratings on the sense of humor were collected. At each session, the humor-related mood (state cheerfulness, seriousness, and bad mood) was assessed before and after the session. Results show that the sense of humor is malleable, noticeable to the trained individuals as well as to peers (but not in the placebo humor group). The sessions increased cheerful mood and decreased seriousness. Life satisfaction generally increased from the pre-training phase to the post-training phase. To conclude, humor can be trained but more work on consolidation strategies are needed in future studies and intervention designs.