Among my other numerous and intricate tasks at work, I also play the temporary role of informatics djin in our research group. I herd machines, mold users (yeah :-| ), tend for software (both sickly commercial licenced stuff and marvelous free gems), test compilers etc. I thus come regularly in contact with absolute new unix users (in the occasion of creating their accounts and guiding them around), that come from 3-4 years of windows history and are cruelly plunged, headfront, into a boiling sea of C++ & g++ & python & Finite Elements & Mathematics & Unix & KDE & XEmacs. People that see a command line for the first time in their life. I have to handhold them during the first days and explain to them why machines don't crash (thus no need to hit the pesky reboot button) and so on.