I remember that advert! I could tell you hundreds of anecdotes, but unfortunately they would all be sexist! Our days (at a record company in the mid seventies) were spent seeing who could do out do each other in actress/bishop jokes. There were no barriers either - the directors would joke with the secretaries and vice versa. I was the telex operator for our company and I was trying to explain to my kids a while back about the ticker tape we used. We had a teleprinter that was a forerunner to a fax machine. Also, the day that all the secretaries got golfball IBM typewriters was very exciting!