logic · paradox
Unexpected hanging
The surprise disappears the moment the last day is impossible.
A judge announces: “You will be hanged on one day next week, and you will not know which day until that morning.”
MonTueWedThuFriIf it cannot be Friday, then it cannot be Thursday, and so on. Every day is ruled out by logic.
Yet the hanging can still happen. The announcement makes the deduction defeat itself.
A surprise test is the same week, told as a quiz.