(proverb) people who complain the most will get what they want
Customer 1: Waiter! My soup is too cold!
Waiter: I’m sorry!
Customer 1: This food is terrible. I’d like to talk to your manager!
Waiter: Right away, sir.
Customer 2: Why are you complaining so much?
Customer 1: The squeaky wheel gets the oil. If I don’t complain then I won’t get my meal for free.
The student complained to the principal that her teacher was unfair because she wanted a good mark. The squeaky wheel gets the oil, and the student was moved to another class.
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