"Infidelity"

 

A sailor suspects his wife is having an affair. His ship is getting underway for a few days, so he decides to set a trap for her. He puts a bowl of buttermilk under the bed. From the bedsprings, he suspends a spoon. He has it calibrated so that her weight on the bed will not drop the spoon into the buttermilk. But, if there is any more weight on the mattress, the spoon will drop into the buttermilk and he will detect it upon his return…

He comes home several days later. The first thing he does is reach under the bed and retrieve the bowl… It’s churned to butter!!!!!