A computer related practical joke a played in my younger days
(2 years ago...) was to write an unstoppable program (disabled
break, ^C, etc...) that would imitate the login procedure. I
would leave it running on a public terminal and whenever
somebody tried to logon, it would always print the message
'User validation error' (Or whatever message corresponding
to the operating system [that was VAX/VMS.] login error)
and loop back.
Meanwhile, the user ID and the password were written in a file
in my directory...
The only way to get out of the program was to turn off the
gandalf box.
YOUR CO-WORKER COULD BE A SPACE ALIEN, SAY EXPERTS . .. here's how you can
tell (by Michael Cassels of the "National Inquirer")
Many Americans work side by side with space aliens who look human -
but you can spot these visitors byy looking for certain
tip-offs, say experts....