Reminds me of a Bank I worked in back in the 70s. We had a (nowadays sexist) rule that any branch had to have at least two men in it. There was a little suburban branch where the staff (just two cashiers, nothing more) were supplied on rota from the bigger town branch - and were just about always one male, one female. So we employed a retired prison officer as "guard". He was pretty much there to make tea and comply with the two males rule and that's all. He had no clerical function. He was required to wear a suit. He was the nicest guy you could hope to meet.
However, if he ever overheard the (junior) staff being tormented by some nasty customer, he would acquire the fiercest expression imaginable - would appear quickly from behind the scenes into the customer area, and (without ever saying as much) would manifest as being completely in charge of the branch. Interesting how the nasiest people settled down - very quickly............happy days!
