This is an example of cultural failure in one Danish academic's attempts to try and "relate" to his students.
Vincent Hendricks getting down with his students
Comment on Hendricks
I partly agree and partly disagree with the second set of comments. There is a professional barrier between students and staff but academics should never appear intimidating.
Certainly when I started I was perhaps too informal and related too much with the students. I was clearing out my old files the other day and I found a birthday card my first cohort of MSc students had given me which had a picture of a guy with a snorkel on the front and the title "M**f Diver". So students can give as much as they take! Except that was mainly a male group and at Masters level.
I would also say that I find that Danish humour can be quite different to US or British humour and they can be pretty rude, both male and female. Humour is definitely a very cultural thing and very dangerous to use.