老虎悖论

unexpected hanging paradox

paradox about a person's expectations about the timing of a future event which they are told will occur at an unexpected time

意外绞刑悖论，又称老虎悖论、突击测验悖论、意外考试悖论，是博弈论中一个著名的逻辑悖论，流传较广。而悖论是指一种导致矛盾的命题。