Devices: Mind Manipulation

There's another different idea,
on how to trigger pp's thoughts

Or rather make them think of certain things
No name for it.
And this method is rather random.
It's like setting a device to activate in the future when you're not around.

E.g. taking someone's cellphone and saving a msg on it.
Maybe months later,
the person's mail becomes full and he decided to delete it.
And he looks for stuffs to delete and accidentally saw the msg you left.

Or it can be something you jus scribbled on a certain page of the person's book.
When he reads it he sees it.

Or that you buy the person's fav drink, and drinks
and keep them in ur home.
Maybe one day, the person might come over for some reason
and note that you have stuffs he likes as well.

As i said, it depends on luck as well.

If the future does not take the path where you have planned the device
then the device might never be discovered or activated
And it'll be wasted effort.