So I thought of a short list of things but started to have a little discussion with myself. Chocolate doesn't always make me smile, especially if I'm trying not to eat it. In fact most things that I could think of make me smile most of the time, not all of the time. So it's actually a tough question.
But then I thought, wait a minute, if these things aren't around but I think of them, I can smile. Or sometimes I'm grumpy because they aren't around. Do they make me grumpy?
But the main thing is when I smile, it's coming from me, it's me that's smiling. So it's me that makes me smile more than anything else. In fact I always make me smile. That's a pretty freeing idea!