A common problem at my school. Caused by punk kids who see humor in spelling out various obsenities by switching around the little key caps. Some day I'd like to see some newbie walk up to one of these machines, start typing, and look really confused as what is on the keyboard is rather different that what shows up on the screen. And since when did home row contain SEXCOW?

One of the more imaginative keyboard defacements I've seen was switching around the order of the keypad, so instead of the usual computer style:

789
456
123

The keys were "telephone style"...

123
456
789

Of course, being the touch typist that I am, none of these defacements are a problem for me.