I once spent a good few minutes on a tea break slating the owner of the firm i worked for with the new boy labourer who was helping out in the holidays. Only for him to announce i was talking about his Dad
I did that sort of. Where I used to work, I had a horrible cow as a supervisor and on a cigarette break, I was telling the new guy I was training to watch her, and it turned out he was her brother
He agreed with my opinion of her