Laughing hard -- even fake laughing (just chanting "Ha, ho, he, heh, ha, ha, ha"); keep fake laughing up long enough, and it will turn into real laughter -- especially if you try not to laugh, for some odd reason. Maybe singing in a fake accent is akin to that.

Creating something -- drawing a picture, writing a poem or song and then giving it away as a present; inventing a cat toy and then watching my two kittle cats leap after it. Anything that provides tangible evidence of my value in the world.