Two girls ate dinner together. They both ordered iced tea. One girl drank them very fast and had finished five in the time it took the other to drink just one.
The girl who drank one died while the other survived. However, all of the drinks that were served turned out to contain poison.
How did the girl who drank the most survive?
The poison was in the ice. When the girl drank the iced tea, the ice was still fully frozen. Gradually, as the ice cubes melted the poison was released into the drink.