When I was studying at the university, we had a practitioner (P) fire at a lecture.
We have a girl in the group who was always late for the first couple because she lived far away. So here. The lecture began, 10 minutes later the door opens and this girl (D) enters with the question:

D Can I enter?
P (correcting the glasses) - another delay and I'll let you go around!

A minute of silence in the audience, a explosion of laughter, until the lecturer comes that he cried, decided to recover and added:
P is administrative.

A bigger explosion of laughter.)