Key
It’s like you’re walking with a key and it all makes sense and then you drop the key down a hole and all of a sudden you watch the key disappear and then you forget what the key looked like and then forget even having a key then standing looking at a hole wondering why you’re standing there and yet there’s a tickle of a thought festering in your mind that you know why you’re standing there and there’s a good reason and then it hits you that you’ll never remember why. Never.