A friend of mine, "BUX", recounts a tale of mirth caused to by two bored
hackers on a PDP/11 running RSTS/E. They wrote a program which wandered
around the system looking for people in the editor. Once found they siezed
control of the terminal. On the bottom of the screen the program wrote
"I think there's a bug in your program!"
Then a cute little character'ature of a bug ran across the screen. Then
the screen was repainted and they relinquished control of the terminal.
Leaving the poor victim cleaning his glasses, checking his coke can, and
rubbing his eyes. This worked best late at night.