Present the clues to the group. They can ask only yes or no questions to try to solve the mystery.
Clue: Two men go to visit a female friend. She offers them soft drinks, which they accept. The drinks are identical in every way. One of the men dies after drinking his drink, but the other man does not. Why did one of the men die?
Answer: There was poison in the ice cubes of both drinks. One man chugged his drink, so the ice didn’t get a chance to melt and release the poison. The other man sipped his drink and was poisoned.