Here is an old logical problem that can be done as a mindreading trick but what is the question?
Suppose you come to a cross road one goes to hell and one goes to paradise but you dont know which is which.
But you are lucky or are you there are two peole present a saint that allways tells the thruth and a devil that allways lies but again you dont know which is which.
You are allowed one question.
What is the question?