ctrl - alt - F2

[Mike Miller]

I did something stupid last night, I pressed ctrl-alt-F2 and totally 
locked up the machine. Actually it may not have been locked up, 
but I was locked out. The monitor went blank and the keyboard 
dead.  Even the caps lock led was dead ! The only way I could 
recover was a hardware reset. Why did I do it? I mis-remembered 
something I'd read about switching from X to console.

The question? Is there a list of commands that should never be 
issued by uninformed newbies?

TIA,
Mike