Riddle: You’re a medieval thief sentenced to public execution. You have to make a statement. If the statement is false, you’re drowned. If the statement is true, you’re killed by a sword. What do you say to live?
Answer: Silly death row inmates thinking they can outsmart the omniscient executioner. In the middle of winter, he ties your head down in a box facing up. Then he brings in a huge sword made of ice and suspends it over your head. To your horror, the warm room rapidly melts the ice sword filling the box. The executioner’s grin slowly becoming harder to see clearly from below the waterline as you slowly drown – killed by an ice sword.