1.5. Two men enter a bar. They both order identical drinks. One lives; the other dies. (CR; partial JM wording)
1.5 answer: The drinks contain poisoned ice cubes; one man drinks slowly, giving them time to melt, while the other drinks quickly and thus doesn't get much of the poison. The fact that they drink at different speeds could be added to the statement, possibly along with red herrings such as saying that one of the men is big and burly and the other short and thin.