Worst one is “just calm down.” I hate that one. Hate it, hate it, HATE IT. One co-worker said it on two occasions to me, and I replied thusly after the second. “What if I slapped you upside the head repeatedly while you were talking. If you have any difficulties keeping your train of thought, I’ll tell you to ‘just calm down.’ Would that help?” “No, I suppose not.” F’n A right it wouldn’t.