Mostly i dont like to deal with this isuue (maybe cause i ain't got enough;)) but here's The Liberator's reason to be happy:

5. Money

Quoting the Liberator:
 I smile because I know I'm in charge of my financial destiny.

You said it right! I dont have a lot of money, i work hard, dont get supported by anyone - and i like it this way! I'm proud to be independed! I'm a healthy person who can look after himself!

Hallelujah!

Please guys, go on posting your ideas and thoughts about what makes you smile! It's helping us all! ;-)