Networking Pranks - Help!!!

[bowers01 +]

Hi,
The schools i work at are closing tomorrow for christmas. Its tradition to pull pranks on the teachers, there are no students there tomorrow.

Previous years weve taken a screenshot set it as the wallpaper and removed the task bar and icons.
run a script to continiously shutdown a teachers laptop using a bat file, and left it running for the day.

And heaps more minor things, but this year we cant think of anything original
i was hoping some people might have ideas?

As were the techs we have full admin rights over the computers.

Cheers,
Nick