I'm total according with Carme, the total happiness doesn't exist, but life have little moments of happiness, and maybe when it happens we don't realise about that, that's a happiness moment, but when we are sad, then we remember happy moments.
When I'm happy I sing a lot and I smile.
Some happiness moments are when i feel the wind in my face, to go out with my friends or when I sunnbath in a beach.