I have this habit of smiling, it makes people think I am unserious, even my mum gets mad when she is on a serious talk and I smile.
Though I get mad, but I still smile because nobody is worth my tears, what I mean is, a smile will make you stay grudge free, even if you are mad with someone, you can't keep it for long because you will definitely smile.
Smile is a wonderful medicine. smile hides lots of pain and at the same time people do not know what is up your sleeves. Keep smiling.