A man went to a temple to find an Oracle. When he arrived, he saw that there were two identical people standing in the temple, both wearing the exact same thing.
The two men told the man that if he wanted his future read, he would have to do something first. They told him that only one of them was the real Oracle and that he had to figure out which is which. They also added that one of them only tells lies while the other only tells the truth and the man could only ask them one question.
What question does the man ask?
The man asks: If you were the opposite one (meaning if the truth-telling one was the liar, etc.), who would you say is the Oracle?
Then the truth-teller would have to point to the fake one and the the liar would have to point to himself.