We have been learning since we were children how to make money, buy things, build things. The whole education system is set up to teach us how to think, not to feel.
We may have forgotten how to feel. Nobody is teaching us how to live happily ever after, as we've heard in fairy tales.
When the needs of one person are being met by the other, there is laughter.
In today's society we sometimes forget to balance our hearts and our heads; this is the reason we stop laughing.