Re: A while ago...
BBC Econet network stunt.
I wrote a Basic program at school that faked the prompt and intercepted commands, returning some like 'dir' correctly, and returning most with 'almost plausible' error messages and locking out key shortcuts for break etc. The teacher left the room once without logging out and I loaded it on his machine and left it running for his return....
*bye
Unrecognised command
..etc...
Loads of entertainment as he got increasingly puzzled and frustrated until he turned the machine off at the back.