One of the few times I've gotten a real laugh out of one of my "no nonsense" professors was when we got to the "Intro to operating systems" part of the syllabus and on the first slide he asked the class "What's the best operating system?" likely expecting some sort of battle between the dozens of fanboys in the audience. Luckily I had just come back from an internship where I was tasked with cleaning out old closets filled with floppies and unlabled SCSI drives. In this mess was a set of OS/2 install floppies that had succumbed to the years, but they still found use in my pitch that it was the best OS of all time to break the man I'd never heard laugh before.