The pet forgetful rock

Most people have organizers or smartphones to remember things for them.
Appointments, shopping lists… that kind of thing.
I have a photographic memory.
I remember everything.
The hard thing for me to do is to forget things.
So, I got a pet rock, and it’s job is to forget things for me.
It just sits there, totally oblivious, unable to remember a thing.
I picked it up and threw it on the grass.
Will it remember that?
Of course not. It doesn’t remember anything.
So, why should I remember?
And, should I lose the stupid thing, will it forget itself?