To not waste time, let's just commit my work and put the message as ".....". Oh, and let's do that dozens of times.

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One day we had to git bisect his work and found that. Then, obviously, we asked him "what the commit with five dots do?" he said that there was a a lot of them, and i proceeded to explain why it was a bad idea to not write a proper commit message.

He is a good dev, so he understood and started to write what the commit does, instead of five dots.