To be fair, I've had this happen to my PowerBook numerous times, mostly when awakening from sleep or messing with video modes (like when setting up on a projector). You have no idea how embarrassing or annoying it is when your cursor is no longer visible, forcing either a restart or login/out again. And trust me, when my Mac misbehaves in a public setting, you can bet that I hear about it from PC users.
I participate on another forum, and I know one guy who takes it upon himself to say things like "Well, that's why I have a Mac, so I never have to deal with that problem" in response to any questions about computer issues, drivers, software, etc. (And this isn't some kid, he's a grown man, married, kids...) You can predict exactly how the rest of the thread goes. Not productive to our "cause" at all.
I don't get myself involved in those conversations, though I may permit myself to smile at people frustrated by Windows issues because I've been there too. That's why I switched back in 2003.