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There is something really crazy I just found out about the login to Unix machines. And I have no clue why this 'feature' still exists besides pure nostalgia! What am I talking about? Well, you might be able to try that for yourself. Ctrl-Alt-Fn-yourself away from the splendor X is and login to your machine. Twice. The second time type your username in all-caps and be surprised. Here is what happens for me:

Welcome to jane!
I am running Linux 2.6.17-jane-2 on a i686.
You are on tty1.
How may I assist you?

jane login: steffen
Password:
Last login: Fri Nov 30 00:31:33 +0100 2007 on tty1.
No mail.
[steffen@jane ~]$ 

Okay, not quite that unusual. But now logging out and retrying it in all-caps:

Welcome to jane!
I am running Linux 2.6.17-jane-2 on a i686.
You are on tty1.
How may I assist you?

jane login: STEFFEN
PASSWORD:
LAST LOGIN: FRI NOV 30 00:32:28 +0100 2007 ON TTY1.
NO MAIL.
[STEFFEN@JANE ~]$