Okay, what's the greatest prank you can play on a friend in this day of technology? Mess with his computer!
This computer prank video tutorial will show you how to fake a virus on Windows by creating a shortcut. It's that simple. Just by creating a shortcut, you could totally freak out your friend with a shutdown message.
All you do is go to create new shortcut and type:
shutdown -s -t 300 -c "your message"
Find more hacks and pranks like this at PC Hacks.