Mr Blunk is the famously surly coal porter at Unseen University. He works under a fundamental misconception based on starting with first principles but making an incorrect logical deduction.
If, however, the sign on the door reads
Egregious Professor of Cruel and Unusual Geography Professor of Slood Dynamics Fretwork Teacher Chair for the Public Misunderstanding of Magic Health and Safety Officer Professor of Virtual Anthropology Lecturer in Approximate Accuracy
Then he counts up the number of names on the door and leaves seven buckets1. No amount of logic, reasoning or request is capable of shaking Mr Blunk out of this.
Now Rincewind has nineteen academic titles, wished on him by the rest of the Faculty in a spirit of schadenfreude, it could get quite warm down his corridor after the sign-writer has been to add the rest.
1 I.e. a Coal Porter medley...