I watched a couple Ramsey Hell Kitchens last night and thought of you.
I've had one boss freak out on me, I sat and smiled and asked "Are you through?"
I've only had one meltdown myself; I/it wasn't pretty. I locked the doors to the lobby and went off for about 2 minutes. I can swear like the sailor I am and this DEFINITELY got their attention
When I was through, I got normal and said "OK, let's get back to work.".