If you’re bored and want to freak out some people, hit CTRL-ALT-and a direction key. It’ll re-orient your screen (if you’re using Windows XP, anyway) and can be quite disconcerting!
The things you learn when falling unconscious on your keyb… I mean, helping out colleagues with their IT issues…
Cheers to Davo/Bruce the wandering Canadian/Australian for enlightening me about this.
Update: it doesn’t seem to work on every machine. :(