Need more interactivity with your computer? My brother told me about using a Wiimote to direct the cursor on a PC a while back, so I thought I'd look into it a bit further.
Basically, the Wiimote uses Bluetooth to connect and send information to the Wii, but people have been able to harness the capabilities of the Wiimote and incorporate them into computers, to control the mouse cursor. So I searched around, and found this cool article on Instructables, a great site for DIY guides to almost anything. You can find that guide to using a Wiimote with you PC here. Just to show you a bit about using a Wiimote with your PC, check out the video below.
So you want to take revenge on your friend, but don't know how? Just today I watched a video on Youtube about how to remotely shutdown a computer using Command prompt. I've looked into this before, but never really tried it out. This is for PCs only, so sorry you Mac users.
The gist of it is basically you:
1. Press the Start Button on your Taskbar



You can burn the .iso file that you download with ImgBurn which you can download here.
To enable Boot-To-CD/DVD options in BIOS, go here here.
The version used in this video was 3.3 build 321.