Happiness is simply a concept, much like everything else. Letters are made up symbols, time doesn't actually exist, sounds are merely vibrations. I've been happy enough, I need some sadness in my life.
Philosophical? I wouldn't consider myself that. I'm simply just a person who has too much time and a curiosity that I know for sure will kill me in the future if I haven't done it myself.
And me to spread derpness to your worlds.