Useful idiom: don't cry over spilt milk

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Can you think of similar idioms or phrases in English or in your native language?

I like to use this idiom when someone spills milk. 

I imagine this idiom to have originated in the 18th century in some rural area, the maid was milking the cow, somehow the milk got knocked on the ground. It's a lot of hard work gone to waste. These days milk is pretty cheap, it's not something people cry over, but in those days it was.