Quote from : Interesting Times: The Play Book

Good so be would you if, duff plum of helping second A," said the Bursar. The table fell silent. "Did anyone understand that?" said Ridcully. The Bursar was not technically insane. He had passed through the rapids of insanity som time previously, and was now sculling around in some peaceful pool on the other side. He was quite often coherent, although not by normal human standards.