Mine was a blue smile indicating, according to the thing at the side, sarcasm. I put it in because I didnt think some would see the sarcasm.
Some years ago I was invited to a party held by a friend who was a librarian. There was NO conversation ... not even about books! Then I found a guy who said he wasn't a librarian. He was wearing a dark suit and lovat green shirt. My hopes were quickly dashed when he said, 'no, I'm not a librarian, I'm an accountant actually.' Looking at my watch I realised that some other mates were still down at the pub so I beat a hasty retreat. There were no such things as IT people then. (Not sure what 'IT' people do really. They dont appear to do very much at all.)