A bright idea rare in social media era. Often in the shower, toilet, or in sleep.
It is quite scarce, and may be some real value from your deep mind, but as it is only short-term generated often you need to write and revisit it once in a while. Of course, this is only if you see at least some value in the thought, but some others also think that not writing it down would trap negativity in your brain - like a Shadow.