Do it for no reason other than that increasing happiness is a good thing. Just go be nice to someone at random today. Someone who you'd never met before. And come back and tell me about it. (popfiend says: If you wish.)
Then repost this meme to your friends list.
[*: popfiend's note: for very mild values of 'should'. I like the idea of this meme, the thought of doing random nice things and telling each other the stories. I'm not posting this in order to generate a forty-comment thread about the inherent condemnation in this meme, since there isn't any, okay? So let's not have such a discussion, please.]
popfiend's Addendum: Just be good to each other today. And if you need a reason, "BECAUSE" is a good one.
My Addendum: Not just today, because today may soon be over for some... Take all weekend and then come and tell me about it!