Romeo and Juliet are found dead on the floor in a bedroom. When they were discovered, there were pieces of glass and some water on the floor. The only furniture in the room is a shelf and a bed. The house in is a remote location, away from everything except for the nearby railway track. What caused the death of Romeo and Juliet?

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Romeo and Juliet are fish. The rumble of the train knocked the tank off the shelf. :)