I've just come across the Beefeater who showed us round the Tower when we last visited in 2012.
It was obvious to me that he was being tongue in cheek from the moment he opened his mouth, but quite a few visitors from overseas looked visibly shocked for a minute or two, until they warmed to his humour.
Most of the Yeoman Wardens are like this, but I especially like this one because he has such manic eyes, and a typical Sargeant Major's air about him.
If you have a few minutes, give this vid a go.....he really starts warming up when he gets to the part where he brings science into it by explaining floaty poo......