[Matra et Alpine]

I'm just a happy kind of guy.

Smile and the world smiles with you

Smiling is not just good for the community in which the sad sack or grouch lives; it is also beneficial to the person doing the grinning. Facial expressions do not merely signal what one feels but actually contribute to that feeling. If we smile even when we don't feel like it, our mood will elevate despite ourselves. Likewise, faking a frown brings on a sense of not much liking the world that day.

in studies of test subjects who were required to smile compared to those who weren't, those instructed to force smiles onto their faces reported feeling happier than their non-grinning counterparts did.

- shamelessly stolen from snopes.com

So decide what you prefer, I have