I'm a foodie. I love eating.
I like to try out a lot of different varieties and once I find something delicious, I order it in large quantity. I'll chow it down like there's no tomorrow.
Whatever my mood is, eating what I love makes me smile.
Same thing when someone around me is sad, my first reaction would be to treat them to something delicious. And you know what really makes me happy? Eating something so awesome to the point that it makes me burp and fart showing a satisfied smile on my face. Such happiness cannot be bought; it can only be tasted from the tip of your tongue.