Well, in the case of the novel I mentioned, that person does read his own future quite often. :) But the "magic ball" usually just tells him whatever it wants and doesn't pay much attention to the owner's future.

There was a case where he was trying to open a big spirit door and he and his friends failed a bunch of times. Then the ball told him that the door would be open by a chosen one. And so they just waited for the chosen one to open it in order to try to get in. :P