“…Previous research provides support for the notion that they can enhance well-being in the general population (e.g., McGhee, 2010b ; Crawford and Caltabiano, 2011 ; Gander et al, 2013 ; Proyer et al, 2014 ; Wellenzohn et al, 2016b ; for an overview see Ruch and McGhee, 2014 ; Ruch and Hofmann, 2017 ), but also in clinical samples [e.g., Hirsch et al, 2010 ; Falkenberg et al, 2011 ; Konradt et al, 2013 ; see also Berger et al (2017) ]. There are group-administered training programs for humor that were found to be effective for enhancing emotional well-being, life satisfaction, psychological well-being, subjective health, positive mood, optimism, and lowering depression, feelings of stress or suicidal tendencies (e.g., Papousek and Schulter, 2008 ; Hirsch et al, 2010 ; Crawford and Caltabiano, 2011 ; Falkenberg et al, 2011 ; Ruch et al, 2018b ; Tagalidou et al, 2018 , Tagalidou et al, in press ; for an overview see McGhee, 2010a , b ). Thus, humor-based PPIs are expected to be well-received by the participants and enable a higher commitment to continue practicing and incorporating the activities into daily life.…”