This is a dirty old milking machine joke that I’ve seen in various forms over the years. I rather like this particular formulation of it:

A very suggestible Wisconsin Dairy farmer watched his new electric milking machine with fascination for some weeks. At length he decided to satisfy his curiosity as to how the machine would serve as a safe and sanitary love object. Once the experiment was begun he found that he was unable to extricate himself. When his wife phoned the factory, she was told “Just keep feeding him and fanning him, lady; that machine is set for four quarts!”

The joke (or probably just this telling of it) is attributed to “Henri Beauchamp” in one of my old humor files, but that doesn’t tell me much.

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