Good Unix pranks for kids?

[Paul Makepeace]

There are utilities to cycle an X server's keyboard lights that can be
used to entertain (make them cycle or fun patterns) as far as drive
someone insane - v. occasional flickerings that are impossible to
catch to the point you start doubting your senses...

On Tue, Sep 28, 2010 at 11:12, Stefan Scheytt <stefan.scheytt at gmail.com> wrote:
> Hello fellow monglers,
>
> Due to parental responsibility, we occasional use x11vnc to have a look at
> what episode of Hanna Montana our 9-year-old is watching on Youtube today.
> (Obviously, we ssh into her machine and sudo to run that program.)
>
> Do you guys know any other fun pranks to play on an unwitting X user from
> a privileged command line?
>
> I found xcowsay, but it doesn't seem to work right. Always bones out on the
> display issue.
>
> Best Regards,
>
>  - Stefan Mechanic
>