But at my first work (begining of 2000s) there was one person that made a fun email, using From of head of company (or was it head of that particular division) to his coworker with congratulations for pay increase and promotion. It would be all great, but that coworker didn't catch the joke and replied to it (person in the From wasn't amused). Author of the joke was fired (which is not easy thing to do in Europe), some people don't catch jokes.