If you search google scholar for ‘happiness” and “wellbeing” there are in excess of 15,000 publications since 2015. There is great interest in finding the common “traits” that happy people seem to have and testing these through controlled interventions. And, not surprisingly, happy people tend to be good humoured! See: “Humor-based online positive psychology interventions: A randomized placebo-controlled long-term trial”; Sara Wellenzohn, RenĂ© T. Proyer, and Willibald Ruch The Journal Of Positive Psychology Vol. 11 , Iss. 6,2