Is it a baby's throaty chuckle?
Is it a bunch of joyful dancers in an unexpected flash mob?
While in Oregon I heard about the JOY billboards that are designed to spread joy and sponsored by the Joy Team [see below]. Maine has a law that forbids billboards of any kind. But imagine signs like this scattered across the country!
Check out their website to see how it is done and to see other examples of their projects.
www.thejoyteam.org a site devoted to spreading joy to millions through billboards, directories of love, joy, kindness, etc.
Note: They also have a site geared for kids called the Junior Joy Team
If you need more ideas for happiness check out some of these websites! [found by googling and exploring the results of searching "happiness"
www.happynews.com an antidote for all the sadness and tragedy in the regular news programs
www.happinesshints.com "How to Create the Happy Life You Deserve
www.happiness-project.com site by the author of the book about a year searching for happiness
www.happiness.com daily happiness tips, funny photos, etc.
www.happiestmoment.org People post photos and descriptions of their happiest moments