Being in a professional environment requires a certain kind of conduct. You can't be too familiar with people and talk to them like they're your besties. You can't ask too many personal questions, like how much they earn, who they voted for in the recent elections, or what they did with their wife last night.
Religion, politics, and intimate relationships should automatically be topics people should never breach at work, whether in a job interview or just a casual conversation at lunch. Yet some people still do it. So when a person asked, "What is the most awkward question you've been asked in a professional setting?" people had all sorts of stories.
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