If you want to use prophetic visions and fortune telling in your games, make sure they're vague and easily misinterpretable. The cool thing is that players will then latch on to the bits they can twist and interpret to make them sound as though they're coming true, and ignore the bits that are blatantly wrong. And you'll come across as a genius.
Of course if you can make a very specific prophecy come true with a bunch of typical gamers, that's true genius. It's probably never happened in the history of gaming.
Anakin: Master Windu, do you ever dream of death?
Mace Windu: I... You know it's funny, I never seem to remember my dreams.
Anakin: I've had dreams about Padmé dying.
Anakin: Do you know who kills her? In my visions?
Mace Windu: I...
Anakin: A Sith Lord.
Mace Windu: What? Who?
Anakin: It's always hazy. Maybe someone in a position of great power.
Mace Windu: Seek the answer with the Force, young Jedi.
Anakin: I sense... a respected figure... Someone with Jedi powers...
Mace Windu: Details... we need details!
Anakin: Look, I'm not saying it's not Chancellor Palpatine.
Mace Windu: Hmmm. Perhaps you could summarise.