There is a prisoner who will be executed, but there is a rule in the kingdom that says, "the prisoner will be given a bag containing a white paper and a black paper. If the prisoner is lucky enough to draw the white paper, he will be released; otherwise he will be executed."
The person preparing the bag hated the prisoner, so he actually put 2 pieces of black paper into the bag instead of 1 black and 1 white. And the prison guard saw this and told the prisoner about it.
Can the prisoner overcome this situation and how? (and be actually released)
Pulling both pieces out of the bag will merit execution.