>>>>>Maybe it's not in vain. Serves several purposes at once - conveys the urgency to the listener, helps the speaker utter something fast without thinking, and at the same time they may ease up a bit after the utterance.
>>>>
>>>>A colleague at work got the Ten Commandments a bit mixed up: "Thou shalt not desire thine neighbors wife in vain".
>>>
>>>"and she's the only neighbor's wife and thou shalt not have other neighbor's wives but her"?
>>
>>"...other neighbors' wives..."
>
>I actually thought about the other neighbor who had too many wives to take care of them all, but you're right, the rest of the neighborhood shouldn't be neglected.

And the cow jumped over the moon!

If you'd meant that then it would have been : "... and thou shalt not have another neighbor's wives but her"