There is easteuropean proverb that says - "Do good deed, eat shit".

Explanation: Whenever you do something good for someone who didn't go out of his way to do you a favor until then, and you don't really benefit from it, it comes back and hits you in the head. Either that someone is going to screw you hard soon after, or what you did for them is going to go over your back. It's just that no one got full from the good parts, except for the shit, of course...

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