Office Poltergeist

Office Poltergeist is a program that allows you to take limited control of another's computer and prank them.
It allows you to:

1. Play spooky sounds
2. Open or close CD drives
3. Transmit text through your victim's keyboard
4. Make windows shake
5. Turn monitors on and off
6. Move windows slightly left and right
7. Send popup alert messages

All you have to do is set up the client on their computer and it will give you their ip address.
Office Poltergeist is open-source and released under the GPL.

There is also a Firefox extension which is even easier to install and adds the option to replace text and open webpages.

Wallpaper Changer - revised post

Today I'd just like to put out a review of WPchanger:

Wpchanger is a compact program that allows you to specify the amount of time between automatic wallpaper changes. You can save lists of wallpaper, and cycle through them in however short time you may want. The free trial is unlimited, but lacks features of the pro version like dual monitor streching wallpaper; it still applies the same wallpaper to each screen.

WPchanger gets my seal of approval.