Oh man, I love Compiz, especially with Emerald running on top, it really blows people away when they see a refined and attractive interface that doesn't really look like either of the two commercial OS'es. Not too surprising he's not familiar with that though, many IT guys I've talked to run Windows most of the time, and they experience Linux mostly through SSH, no gui there, ha. Still, I find it hard to believe that many IT guys aren't also tech enthusiasts who wanna try everything, like we are.
But yeah, iOS is indeed forked from OSX, built on the same Darwin core components, which is itself BSD derived, as you know. Specifically, their kernels are Unix-derived, and therefore feel quite similar through a terminal to our preferred Linux based OS'es, including of course Android. I would hope there's not an IT guy out there who doesn't know that the phone in his pocket is running a Unix-based kernel, but I guess I shouldn't be surprised.