fly-on-the-wall

Animal idioms-快樂閱讀網: "By using concealed cameras, fly-on-the-wall television programmes or films show people doing what they normally do every day. Big Brother is a good example of this type of reality TV programme. We use the expression fly-on-the-wall because if a fly settles on your wall at home, you do not normally notice it. Note that fly on the wall is also used as a compound noun:

I'd like to have been a fly on the wall when your boss heard he'd been fired."

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