Fun article from Christopher Phin in Macworld:

You can date an Apple user as accurately as a botanist counting rings to date a tree, and you don’t even have to cut them in half first.

What you do is work out what they call the Mac’s secondary modifier key. This is trickier to do than you might think, as evidenced by how I had to come up with that awkward description rather than name it myself and so skew your response.

I won’t spoil it, but I’m definitely what Phin calls “a more seasoned veteran”, though I certainly could be a “true keeper of the flame” considering my pre-Macintosh Apple experience.