Suspecting that his wife had a lover, but still having to be away for a day and a night, the very clever husband came up with an idea.

Under their bed, he placed a saucepan filled with milk, and above it, attached to the bottom of the bed, a wooden spoon. By his calculations, the weight of his wife shouldnt be enough for making the spoon reach the milk; but if she had company in bed, the spoon would get a white line, and the affair would be revealed.

So, the next day, as soon as he got home, he went to the bedroom and inspected the result of his plan…

The saucepan was filled with butter!