If you don't write the things in your head, all your ideas and epiphanies will never see the light. They will die with you.

Even if it is a bad idea, memory, story, joke or comment. Someone can come years or weeks later and flip it on its head. Make it beautiful if you could not.

I'm not saying you have to write a masterpiece on this second rate Fanficion.com
But I am saying. Don't forget the littlest thing. It could strike a heartstring and make something better.