I’m never getting accustomed to the fact that there’s now an entire generation of coders who have never seen a world where "everything" is open-source and developed in the bazaar style (are people these days even aware of the metaphor or Raymond’s book?), a world in which the frigging Microsoft is a major OSS vendor and in charge of facilitating most of the open-source programming on the planet. Try explaining that to a time traveler from the late 90.

(Also, as a sibling comment implied, the archetypal "bazaars", like the Linux kernel project, now appear quite cathedral-like in conparison to the free-for-all GitHub model!)