I'd like to share with you all something I've been doing for a while now...
Practicing random acts of generosity. No matter how big or small, random acts of generosity (towards complete strangers especially) will almost always make that person's day. If you see somebody at the store with a lot of groceries, offer to help them take it out to their car. If you see somebody asking for change, don't hesitate to give them some (unless you don't have any, in this case I usually just tell them I have no money and apologize).
What you almost always get back in return is worth the universe to me -- to see people happy, and if you're lucky, they might just do it too. If you offer to help and they decline, most of the time they're even just happy that you offered.
Part of the reason why I like to do this so much is also because since 9/11, society has sort of clammed up. People keep to themselves most of the time. Even though I was only 11 when 9/11 happened, I remember the drastic societal changes, and this was one of them. Fact is, people are letting fear rule them and don't want to take chances. But just by offering help or giving something away for free, you can hopefully help restore America to the caring, helping society it once was (or should be, anyways).
Just my 0.0127 euros.