How do you create good mood?

I'm in a very good mood since yesterday. I kept telling everybody that I'm happy!
Yes, I am
And I know many people want to feel the way I do. What's up? Nothing's particular, actually. Life goes as usual. Nothing's new.
I just wanted to light up my mood.

There are many things that make us glad (and there are more things that ruin our day). For me, it's just like seeing Kirihiko san on W.

If only we able to pick the good ones and let go the bad ones, I bet we'll be very happy.
When you're happy, you tend to see things in color, not only black or grey. Life is wonderful and no matter people try to hurt you, you can stand it.
I'm more powerful against all negative effect yesterday and still I'm that strong today.
Are you?