Cosmic humor, not taking ourselves too seriously, not taking this self so seriously, is useful because learning how to see the self as something changing is helpful. How can it be developed? Develop more spiritual joy and it seems to occur, because we start to see our folly and we have a lot more inner happiness that rolls over into other areas. But we have to be careful with humor, because sometimes people tell jokes to get fame and "be someone". So we have to also be careful with our humor and make sure it is skillful, because humor can also be sarcasm and all these other things, which are based more in aversion.