When I go to play, it's my time to get away from life's worries and small troubles. It's kind of an escape. When I'm playing pool I'm not thinking about anything but pool, and since I enjoy the game, usually my disposition is really good. Also a side benefit of me going to play is there are some "characters" that frequent my hall, and more than not, you will be rolling on the floor laughing at some of the shit they do and say. Hell, I'd go there even if I didn't play pool to get some laughs.
I find that life is too short to take too many things seriously, so I would rather laugh a lot and have a shit load of fun, than be serious and a negative nelly. Being serious and stressing out all the time can take a heavy toll on your health. When I die, it won't be from not enjoying life and having a sense of humor I can promise you that.