Everything you know is wrong. Discuss.

Maurice Charlesworth was my philosophy lecturer at Bangor University. He was, to me at least, something of a legend. He came to work dressed in a brown suit with brown shirt, tie, socks, shoes and briefcase. He was perhaps the world's only Tasmanian nationalist, had a dry and cruel sense of humour which he directed particularly towards the Christian section of the student body, and told us that he took a few minutes during his wedding reception to prove the non-existence of God to his new mother-in-law. He also dealt with people signing in as Donald Duck by undertaking graphological analysis of the entire class. His favourite illustration of the degenerate nature of our times was to remind us that whereas he used to employ a psychologist in his philosophy department, he was now the philosopher in the psychology department.

All this is tangential, however. The abiding memory I have of Maurice is his mantra that a class has failed if the participants think they understand what's just happened, and that the world is just as they thought. He always managed to leave me exhilarated, confused and inspired - the mark of a great teacher, I think. Every session left us drunk with intellectual curiosity and wonder.

Maurice's philosophy colleague, Ed Ingram, was equally bizarre and brilliant, though totally contrasting. Ed wore shorts and vomit-inducing Hawaiian shirts. He clearly had an absolutely brilliant time in the 60s or 70s, and had barely recovered. He was a former computer programmer who handled all the science-related philosophy with amazing precision and joy. We'd turn up, have our heads completely messed up by quantum physics and the like, then go for a soothing drink. We'd then meet Ed in the street and he'd ask us things like where he lived, or what day it was. Between them and Tony Brown, my learned, kind and wise English tutor, these people made teaching a potential avenue for me - shame the only quality I share with them is a gift for sarcasm…