The light he switched off was the lighthouse lamp. In the morning he saw the wreck on the rocks.
A man gets up in the night for a glass of water, turns off the light and goes back to bed. In the morning he looks out of the window, screams and kills himself. Why?
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His light was for other people.
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He was a lighthouse keeper, and a ship had hit the rocks
Source: Agnes Rogers and Richard Sheehan, How Come, Again?, 1960