I think "don't cry over spilt milk" had more to do with loss in yesteryear. Now it's a warning about not lamenting having to clean up a mess. Sad but possibly true. 
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koala:
Heh, I think it deff. means what you said, and I think it also means what all these lovely people above me thought it meant! 
groove:
Not to mention the smell of turning milk, if you miss a spot.