Reminds me of a story from my first real job. One of our PCs had developed some problem, and my boss and I had opened it up and were pointing at things with screwdrivers and trying to guess what might be wrong, when one of our tech writers came in and said, "You shouldn't be poking around in there if you don't know what you're doing."
We looked up in bewilderment and replied, "How do you think you get to be an engineer?"
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We looked up in bewilderment and replied, "How do you think you get to be an engineer?"