Having a discussion with someone who quotes Dijkstra can be frustrating. He wrote Go To Statement Considered Harmful and On the Cruelty of Really Teaching Computer Science and left behind a bunch of pithy quotes to mine besides. You end up having to explain why blanket bans on goto don't make sense, why it really is quite difficult to mathematically prove that a program works, or why it makes sense to teach students software engineering and not just teach them the mathematics.

At this point I'm ready to say "Dijkstra considered harmful" or "the use of Dijkstra quotes cripples the mind, their use in discussions should, therefore, be regarded as a criminal offence."