Badmouthing The Boss
You're complaining about your boss, not realizing s/he's right behind you.
Alice has finally had enough at the workplace, and she's complaining to Bob about what a low-life, cheapskate slimeball her boss is. Wait, why is Bob frantically trying to cut her off-- The boss is right behind her, isn't he? This trope, often seen in Work Coms, is when someone decides to vent a little by talking smack about his or her boss, not realizing that the boss in question can hear everything s/he's saying. Usually, this leads to a lot of trouble for the Employee. Examples Western Animation
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