Like any other Apple product, OS X prides itself on the little details. When, earlier last week, I used my professor's Mac briefly to give a quick project presentation (mine decided to do a chkdsk at the wrong time, heh), I got the distinct feeling some were put intentionally to make the uninitiated look stupid.
What are the small usability details that Windows and Linux users will trip on when their Mac using friend lend them their beloved Mac for some quick web browsing?