When you flip a coin to decide between two things you really want, it doesn't really matter what the coin finally says. The real way to know what you truly want is that millisecond while the coin is in the air, spinning and falling. In that moment you know what you WISH the coin would be and that right there is your answer.
It's something I remember seeing in a movie and I don't even remember which one. But it makes way too much sense to be forgotten. And it works, I've tried it.