Question: Are there thoughts, ideas, or feelings that can't be remembered?
I don't mean things that you forget all the time (like to whom you've told a particular story) or even very lengthy chunks of information that are difficult to remember in one go (like a software key). I mean thoughts and ideas that are possible to think about - but impossible to put into storage or recall.
Imagine if some of life's greatest mysteries were in this unstorable format; the origin of the universe, the cure for the common cold, and why exactly your girlfriend is angry at you.
Keep a lookout for these moments. If you can remember it long enough to tell someone, though, you probably haven't found one.