I don't know why people's mood can change rapidly and without a reason even though I go through the same thing too.

I was actually in quite a good mood today in school, didn't even complain much during drawing lesson and actually greeted quite a few people before they greeted me.

And then my mood went down; I'm not even sure of the reason myself.

Maybe it was because I rewatched Jigoku Shoujo Season 1 and 2, and was reminded of the ugliness of humans. Sure some of the episodes had stories too blown up and dramatic to be true in order to make the show more interesting, but it doesn't stray that far from the truth.

Some say life is beautiful, some say life is unfair, I prefer 'life is full of up and downs' just that there're more downs than ups.

And the down curve is a lot deeper most of the time too.

Everyone is different, that's why things affect everyone differently. Something to you that is small and meaningless might meant the world to another. Same is with one's action and words.

A thoughtless action from you; a careless word from your mouth; they may just slip out and you won't think much of it, but unknown to you, it might leaves someone feeling hurt and depress afterwards.

You will never know. Neither will I unless I'm the one on the receiving end, and that's something that happened all too often.